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Welcome David Wish,
Thank you for posting to Microsoft Q&A.
I understand that you're using a Microsoft 365 Personal account on macOS and Copilot displays an"Authentication required" message but does not allow you to complete the sign-in process.
Before we continue, could you please confirm:
- Are you using the Copilot app for macOS or Copilot in a web browser?
- Does the error appear immediately after selecting Authentication required, or are you redirected to a Microsoft sign-in page first?
- Which macOS version are you currently using?
In the meantime, please try these quick checks:
- Sign out of Copilot completely, close the application, reopen it, and sign in again.
- If you are using Safari, open Safari > Settings > Privacy and temporarily make sure Prevent cross-site tracking is turned off, then test Copilot again. Microsoft states that authentication and license validation can fail when required cookies are blocked. I am getting license validation errors with Copilot
- Test Copilot from a private browser window at copilot.microsoft.com. This helps determine whether the issue is specific to the macOS app or affects the account everywhere. Getting started with Copilot on macOS
Looking forward to your update.