I can no longer access my data in OneDrive via my xxxx@tukl.onmicrosoft.com Microsoft 365 account.

You try to access your data in OneDrive with your xxxx@tukl.onmicrosoft.com Microsoft 365 account from Dr.Vis, but the following error message appears:
"Your account has been locked. Contact your support person to unlock it, then try again."

Accounts of the form xxxx@tukl.onmicrosoft.com have been rental licenses with a limited duration and are no longer included in the new Microsoft federal contract 3.0 2021. Unfortunately, we are therefore unable to help you or provide subsequent access to your data stored in the OneDrive cloud. By the way, we never had this right at any time, even if the Microsoft hotline sometimes presented it that way.