The error code AADSTS5000225 indicates that the tenant has been blocked due to inactivity. This typically happens when a configured tenant is no longer in use, and Microsoft takes steps to reduce unnecessary expenses by making it inaccessible.
As an administrator, you can request to reactivate the tenant within 20 days of it entering this inactive state. If you do not plan to reactivate it, be aware that the tenant will be deleted after 20 days and cannot be recovered.
To reactivate your tenant, you should reach out to Microsoft support. It's important to refrain from submitting multiple assistance requests while your case is being processed.
For more details on handling an inaccessible tenant, you can refer to the relevant Microsoft documentation.