Microsoft 365 login problem on latest Canary 27842

I will add one more note:

When I create a new file, e.g. Word on the desktop, I cannot open it from either Microsoft 365 or Microsoft 365 Copilot. The first program asks for a login, the second displays the prompt I wrote about ("This content is a potential security problem. Do you trust this content?" - the file does not have my ownership) although in the second I have the status of a logged-in person.

On the other hand, if I create a Word file in Microsoft 365 Copilot and save it to the desktop, then - as I wrote - I can work on it and open it from Copilot (where I have no problem with logging in/licensing), but from the regular Microsoft 365 level I get a login request, error 2604 or 2603 and activation block despite an active license on the Microsoft account.

I put also my service request topic on Microsoft 365 Insider forum here:

https://answers.microsoft.com/en-us/officeinsider/forum/offinsd_access-offinsdsub_win/microsoft-365-login-problem-on-latest-canary-27842/6d832ef4-9913-4b59-82d9-7619ec82ec69