diff --git a/_locales/en/messages.json b/_locales/en/messages.json
index cafa1c320..9c6bca17d 100644
--- a/_locales/en/messages.json
+++ b/_locales/en/messages.json
@@ -590,6 +590,8 @@
   "noMessagesInEverythingElse": "You have no messages from <b>$name$</b>. Send a message to start the conversation!",
   "hideBanner": "Hide",
   "someOfYourDeviceUseOutdatedVersion": "Some of your devices are using outdated versions. Syncing may be unreliable until they are updated.",
+  "versionRequiredForNewGroupDescription": "Users must have version {VERSION} or higher to receive invitations",
+  "upgradeYourGroupBefore": "Groups have been upgraded. Upgrade your group chats by creating a new Group. Support for old Groups will be discontinued on [Date].",
   "openMessageRequestInboxDescription": "View your Message Request inbox",
   "clearAllReactions": "Are you sure you want to clear all $emoji$ ?",
   "expandedReactionsText": "Show Less",
diff --git a/ts/components/NoticeBanner.tsx b/ts/components/NoticeBanner.tsx
index 255926d82..592f113db 100644
--- a/ts/components/NoticeBanner.tsx
+++ b/ts/components/NoticeBanner.tsx
@@ -1,7 +1,8 @@
-import React from 'react';
+import React, { SessionDataTestId } from 'react';
 import styled from 'styled-components';
 import { Flex } from './basic/Flex';
-import { SessionIconButton } from './icon';
+import { SessionIconButton, SessionIconType } from './icon';
+import { StyledRootDialog } from './dialog/StyledRootDialog';
 
 const StyledNoticeBanner = styled(Flex)`
   position: relative;
@@ -23,11 +24,13 @@ const StyledText = styled.span`
 
 type NoticeBannerProps = {
   text: string;
-  dismissCallback: () => void;
+  icon: SessionIconType;
+  onButtonClick: () => void;
+  dataTestId: SessionDataTestId;
 };
 
 export const NoticeBanner = (props: NoticeBannerProps) => {
-  const { text, dismissCallback } = props;
+  const { text, onButtonClick, icon, dataTestId } = props;
 
   return (
     <StyledNoticeBanner
@@ -35,17 +38,43 @@ export const NoticeBanner = (props: NoticeBannerProps) => {
       flexDirection={'row'}
       justifyContent={'center'}
       alignItems={'center'}
+      data-testid={dataTestId}
     >
       <StyledText>{text}</StyledText>
       <SessionIconButton
-        iconType="exit"
+        iconType={icon}
         iconColor="inherit"
         iconSize="small"
         onClick={event => {
           event?.preventDefault();
-          dismissCallback();
+          onButtonClick();
         }}
       />
     </StyledNoticeBanner>
   );
 };
+
+const StyledGroupInviteBanner = styled(Flex)`
+  position: relative;
+  background-color: var(--orange-color);
+  color: var(--black-color);
+  font-size: var(--font-size-sm);
+  padding: var(--margins-xs) var(--margins-lg);
+  text-align: center;
+  flex-shrink: 0;
+
+  // when part a a dialog, invert it and make it narrower (as the dialog grows to make it fit)
+  ${StyledRootDialog} & {
+    background-color: unset;
+    color: var(--orange-color);
+    max-width: 300px;
+  }
+`;
+
+export const GroupInviteRequiredVersionBanner = () => {
+  return (
+    <StyledGroupInviteBanner data-testid="invite-warning">
+      {window.i18n('versionRequiredForNewGroupDescription')}
+    </StyledGroupInviteBanner>
+  );
+};
diff --git a/ts/components/SessionInboxView.tsx b/ts/components/SessionInboxView.tsx
index bc69090b2..df3b0b78b 100644
--- a/ts/components/SessionInboxView.tsx
+++ b/ts/components/SessionInboxView.tsx
@@ -120,7 +120,9 @@ const SomeDeviceOutdatedSyncingNotice = () => {
   return (
     <NoticeBanner
       text={window.i18n('someOfYourDeviceUseOutdatedVersion')}
-      dismissCallback={dismiss}
+      onButtonClick={dismiss}
+      icon="exit"
+      dataTestId='some-of-your-devices-outdated-inbox'
     />
   );
 };
diff --git a/ts/components/SessionWrapperModal.tsx b/ts/components/SessionWrapperModal.tsx
index c75a64c0d..cf5a2cfe6 100644
--- a/ts/components/SessionWrapperModal.tsx
+++ b/ts/components/SessionWrapperModal.tsx
@@ -5,6 +5,7 @@ import useKey from 'react-use/lib/useKey';
 import { SessionIconButton } from './icon';
 
 import { SessionButton, SessionButtonColor, SessionButtonType } from './basic/SessionButton';
+import { StyledRootDialog } from './dialog/StyledRootDialog';
 
 export type SessionWrapperModalType = {
   title?: string;
@@ -63,7 +64,7 @@ export const SessionWrapperModal = (props: SessionWrapperModalType) => {
   };
 
   return (
-    <div
+    <StyledRootDialog
       className={classNames('loki-dialog modal', additionalClassName || null)}
       onClick={handleClick}
       role="dialog"
@@ -125,6 +126,6 @@ export const SessionWrapperModal = (props: SessionWrapperModalType) => {
           </div>
         </div>
       </div>
-    </div>
+    </StyledRootDialog>
   );
 };
diff --git a/ts/components/conversation/SessionConversation.tsx b/ts/components/conversation/SessionConversation.tsx
index df5128e6a..df9f157a2 100644
--- a/ts/components/conversation/SessionConversation.tsx
+++ b/ts/components/conversation/SessionConversation.tsx
@@ -251,26 +251,15 @@ export class SessionConversation extends React.Component<Props, State> {
     // TODOLATER break selectionMode into it's own container component so we can use hooks to fetch relevant state from the store
     const selectionMode = selectedMessages.length > 0;
 
-    const bannerText =
-      selectedConversation.hasOutdatedClient &&
-      selectedConversation.hasOutdatedClient !== ourDisplayNameInProfile
-        ? window.i18n('disappearingMessagesModeOutdated', [selectedConversation.hasOutdatedClient])
-        : window.i18n('someOfYourDeviceUseOutdatedVersion');
-
     return (
       <SessionTheme>
         <div className="conversation-header">
           <ConversationHeaderWithDetails />
-          {selectedConversation?.hasOutdatedClient?.length ? (
-            <NoticeBanner
-              text={bannerText}
-              dismissCallback={() => {
-                const conversation = ConvoHub.use().get(selectedConversation.id);
-                conversation.set({ hasOutdatedClient: undefined });
-                void conversation.commit();
-              }}
-            />
-          ) : null}
+          <OutdatedClientBanner
+            ourDisplayNameInProfile={ourDisplayNameInProfile}
+            selectedConversation={selectedConversation}
+          />
+          <OutdatedLegacyGroupBanner selectedConversation={selectedConversation} />
         </div>
         {isSelectedConvoInitialLoadingInProgress ? (
           <ConvoLoadingSpinner />
@@ -652,3 +641,50 @@ const renderImagePreview = async (contentType: string, file: File, fileName: str
     thumbnail: null,
   };
 };
+
+function OutdatedClientBanner(props: {
+  selectedConversation: Pick<ReduxConversationType, 'id' | 'hasOutdatedClient'>;
+  ourDisplayNameInProfile: string;
+}) {
+  const { selectedConversation, ourDisplayNameInProfile } = props;
+  const bannerText =
+    selectedConversation.hasOutdatedClient &&
+    selectedConversation.hasOutdatedClient !== ourDisplayNameInProfile
+      ? window.i18n('disappearingMessagesModeOutdated', [selectedConversation.hasOutdatedClient])
+      : window.i18n('someOfYourDeviceUseOutdatedVersion');
+
+  return selectedConversation.hasOutdatedClient?.length ? (
+    <NoticeBanner
+      text={bannerText}
+      onButtonClick={() => {
+        const conversation = ConvoHub.use().get(selectedConversation.id);
+        conversation.set({ hasOutdatedClient: undefined });
+        void conversation.commit();
+      }}
+      icon="exit"
+      dataTestId="some-of-your-devices-outdated-conversation"
+    />
+  ) : null;
+}
+
+function OutdatedLegacyGroupBanner(props: {
+  selectedConversation: Pick<ReduxConversationType, 'id' | 'isPrivate' | 'isPublic'>;
+}) {
+  const { selectedConversation } = props;
+
+  const isLegacyGroup =
+    !selectedConversation.isPrivate &&
+    !selectedConversation.isPublic &&
+    selectedConversation.id.startsWith('05');
+
+  return isLegacyGroup ? (
+    <NoticeBanner
+      text={window.i18n('upgradeYourGroupBefore')}
+      onButtonClick={() => {
+        throw new Error('TODO'); // fixme audric
+      }}
+      icon="externalLink"
+      dataTestId="legacy-group-banner"
+    />
+  ) : null;
+}
diff --git a/ts/components/dialog/InviteContactsDialog.tsx b/ts/components/dialog/InviteContactsDialog.tsx
index 86bfd0ad3..6f80fac8e 100644
--- a/ts/components/dialog/InviteContactsDialog.tsx
+++ b/ts/components/dialog/InviteContactsDialog.tsx
@@ -31,6 +31,7 @@ import { SessionWrapperModal } from '../SessionWrapperModal';
 import { SessionButton, SessionButtonColor, SessionButtonType } from '../basic/SessionButton';
 import { SessionSpinner } from '../basic/SessionSpinner';
 import { SessionToggle } from '../basic/SessionToggle';
+import { GroupInviteRequiredVersionBanner } from '../NoticeBanner';
 
 type Props = {
   conversationId: string;
@@ -186,12 +187,16 @@ const InviteContactsDialogInner = (props: Props) => {
 
   return (
     <SessionWrapperModal title={titleText} onClose={closeDialog}>
+      {hasContacts && isGroupV2 && <GroupInviteRequiredVersionBanner />}
+
       <SpacerLG />
       {isGroupV2 && (
-        <span style={{ display: 'flex', alignItems: 'center' }}>
-          Share History?{'  '}
-          <SessionToggle active={shareHistory} onClick={() => setShareHistory(!shareHistory)} />
-        </span>
+        <>
+          <span style={{ display: 'flex', alignItems: 'center' }}>
+            Share History?{'  '}
+            <SessionToggle active={shareHistory} onClick={() => setShareHistory(!shareHistory)} />
+          </span>
+        </>
       )}
       <div className="contact-selection-list">
         {hasContacts ? (
diff --git a/ts/components/dialog/StyledRootDialog.tsx b/ts/components/dialog/StyledRootDialog.tsx
new file mode 100644
index 000000000..d98a95fae
--- /dev/null
+++ b/ts/components/dialog/StyledRootDialog.tsx
@@ -0,0 +1,3 @@
+import styled from 'styled-components';
+
+export const StyledRootDialog = styled.div``;
diff --git a/ts/components/leftpane/overlay/OverlayClosedGroup.tsx b/ts/components/leftpane/overlay/OverlayClosedGroup.tsx
index a5609094d..fe8db6d1b 100644
--- a/ts/components/leftpane/overlay/OverlayClosedGroup.tsx
+++ b/ts/components/leftpane/overlay/OverlayClosedGroup.tsx
@@ -23,6 +23,7 @@ import { getSearchResultsContactOnly, isSearching } from '../../../state/selecto
 import { useOurPkStr } from '../../../state/selectors/user';
 import { SessionSearchInput } from '../../SessionSearchInput';
 import { SpacerLG } from '../../basic/Text';
+import { GroupInviteRequiredVersionBanner } from '../../NoticeBanner';
 
 const StyledMemberListNoContacts = styled.div`
   font-family: var(--font-mono), var(--font-default);
@@ -178,6 +179,10 @@ export const OverlayClosedGroupV2 = () => {
       <SessionSpinner loading={isCreatingGroup} />
       <SpacerLG />
       <SessionSearchInput />
+      {!noContactsForClosedGroup && window.sessionFeatureFlags.useClosedGroupV2 && (
+        <GroupInviteRequiredVersionBanner />
+      )}
+
       <StyledGroupMemberListContainer>
         {noContactsForClosedGroup ? (
           <NoContacts />
diff --git a/ts/react.d.ts b/ts/react.d.ts
index ba47a8b34..92b76d5ea 100644
--- a/ts/react.d.ts
+++ b/ts/react.d.ts
@@ -51,6 +51,10 @@ declare module 'react' {
     | 'microphone-button'
     | 'call-button'
     | 'attachments-button'
+    | 'invite-warning'
+    | 'some-of-your-devices-outdated-conversation'
+    | 'some-of-your-devices-outdated-inbox'
+    | 'legacy-group-banner'
 
     // generic button types
     | 'emoji-button'
diff --git a/ts/types/LocalizerKeys.ts b/ts/types/LocalizerKeys.ts
index 458be881c..8bbc5a6b3 100644
--- a/ts/types/LocalizerKeys.ts
+++ b/ts/types/LocalizerKeys.ts
@@ -290,8 +290,8 @@ export type LocalizerKeys =
   | 'leaveGroupConfirmation'
   | 'leaveGroupConfirmationAdmin'
   | 'leaveGroupConfirmationOnlyAdmin'
-  | 'leaveGroupConfirmationOnlyAdminWarning'
   | 'leaveGroupConfirmationOnlyAdminLegacy'
+  | 'leaveGroupConfirmationOnlyAdminWarning'
   | 'leaveGroupFailed'
   | 'leaveGroupFailedPleaseTryAgain'
   | 'leaving'
@@ -575,6 +575,7 @@ export type LocalizerKeys =
   | 'unreadMessages'
   | 'updateDisappearingMessagesFallback'
   | 'updateGroupDialogTitle'
+  | 'upgradeYourGroupBefore'
   | 'userAddedToModerators'
   | 'userBanFailed'
   | 'userBanned'
@@ -582,6 +583,7 @@ export type LocalizerKeys =
   | 'userRemovedFromModerators'
   | 'userUnbanFailed'
   | 'userUnbanned'
+  | 'versionRequiredForNewGroupDescription'
   | 'video'
   | 'videoAttachmentAlt'
   | 'viewMenuResetZoom'