The error message AADSTS5000225: This tenant has been blocked due to inactivity indicates that the Azure tenant associated with your account has been made inaccessible due to a lack of activity. If you are the tenant administrator, you can request reactivation within 20 days of the tenant entering this inactive state. If the tenant remains inactive for longer than 20 days, it will be deleted and cannot be recovered.
To reactivate your tenant, you should reach out to Microsoft support. It is important to refrain from submitting multiple assistance requests while your existing case is being processed.
If you do not plan to reactivate the tenant, it will be deleted after the 20-day period.
For application owners and developers, it is advised to minimize authentication requests to the deactivated tenant until it is reactivated.