Welcome Maureen Lilla,
Thank you for posting to the Microsoft Q&A forum.
I understand that one of your Copilot chats is visible in the chat list but displays a "can't display" message when you try to open it, while your other chats migrated successfully.
To better understand what happened, could you let us know:
- Are you using the same Microsoft account that originally created the chat?
- Does the affected chat fail to open in both the Copilot website and the Copilot mobile app, or only in one location?
As a quick test, please sign in to Copilot from a different browser or an InPrivate/Incognito window and check whether the chat opens there. This helps determine whether the issue is related to the local browser session or the chat record itself.
Looking for your update.