Dear @Ben Hübner,
Good day! Welcome to Microsoft Q&A forum!
Based on your description, I understand that you want to use your personal email address as the primary alias for your Microsoft account, but you’re encountering an error because the address is still linked to a former work account. You no longer have access to that account, you're also unable to contact the organization. So you would like assistance in releasing the email address or associating it with your personal account.
I sincerely apologize for the inconvenience caused by this issue.
To understand the situation better and provide you with the most suitable support, could you confirm the following information:
- Was this email address originally provided by your former company as part of their Microsoft 365 or Azure AD setup?
- Did you create a personal Microsoft account using this same email address while you were working there?
- When you try to sign in now, do you see options for both ‘Work or school account’ and ‘Personal account’?
- You mentioned that you're unable to contact the organization, may I ask if you've encountered any problem reaching out to them? Do you have any contact with the former organization’s IT team or admin from your former colleagues who could remove the account? (If yes, that’s the fastest resolution.)
- Are you able to sign in to your personal email address that was previously associated with an AD account from a former organization and that you're the rightful owner of?
Your confirmation would be very helpful in ensuring you receive the most suitable support!
If you’re able to share a bit more about your situation, I might be able to suggest some helpful next steps.
Kindly let me know when there are updates or if you need further assistance. Any updates you’re able to share would be really helpful. I appreciate your time and look forward to hearing how things are going!
Thank you for your time and patience.
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