Thank you for explaining the sequence clearly. Since Copilot works in the browser, your Microsoft 365 Family subscription is active, and signing back into the iPhone app temporarily restores access, this does not look like a problem with the subscription itself. It more likely involves the app retaining outdated account or subscription information after the billing change.
Deleting your chat history should not normally change your subscription entitlement, so that may simply have happened around the same time.
You have already completed the main troubleshooting steps, including reinstalling the app. Also, because your current Family subscription was purchased directly from Microsoft, I would not try to restore the cancelled Apple purchase.
At this point, please contact Microsoft Support and ask them to check the entitlement associated with your Microsoft account and the Copilot iOS app. Include these details:
- The previous plan was Microsoft 365 Personal billed through Apple.
- The current plan is Microsoft 365 Family billed directly by Microsoft.
- You are the subscription owner.
- Copilot works in a browser.
- The iPhone app shows the trial screen after being closed and reopened.
- Signing out and back in fixes it only temporarily.
This is a user-to-user forum, so forum moderators cannot inspect or refresh the account’s subscription status from the back end.
Thank you for your understanding and time