Hi Hubschmid, Sven,
Thank you for reaching out to Microsoft Q&A forum.
Have you successfully logged in before? There could be several reasons for the account being locked. in this case, I suggest that you kindly follow some basic troubleshooting steps.
- If you have entered the wrong password for the account, you may have gotten locked for that reason.
- If you tried to sign in to your account and received a message that it's been locked, it's because activity associated with your account might violate our Terms of Use.
Try logging in from a different browser or device to see if that resolves the issue.
Check your credentials: Verify that the login credentials you are using for your organization’s account are correct. Make sure your account is active and not locked out, and that you are using the right login and password.
Check firewall settings: Check with your IT department to ensure that the necessary ports and protocols are open. It's possible that your organization's firewall is blocking access also, check the troubleshooting guide.
If the information provided has been helpful to you then please accept the answer by clicking the “Accept Answer” on the post. We value your feedback, and it will help us to assist others who might have a similar query.
Thank you for your contribution in improving Microsoft Q&A.
Thank you.