Dear peter schrader
Good day! Thank you for posting in the Microsoft Community. We'll be happy to help!
First of all, we regret for the inconvenience caused to your work. Based on your description, I have a general understanding of your question, you have to ask your admin within your old organization for help. Please kindly refer to: Change a user name and email address - Microsoft 365 admin | Microsoft Learn
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In addition, if you still need further help, due to the lack of relevant permissions and tools on our forum, in order to help you better and not waste any more time, it is advisable to contact our 365 support team directly by phone and they will help you further. For more information, see the following screenshots or white papers: Search for Microsoft 365 for business support phone numbers by country or region
Note: Please note that you must call the hotline Monday through Friday (9 a.m. to 5 p.m., Monday through Friday), sincerely apologize, and thank you again.
During the phone call, press "1" as a business email user and press "1" again for technical support. You may be asked for certain information for verification, such as account or subscription information, organization information, and phone number.
Here are some other phone numbers for support around the world: Global customer service phone numbers - Microsoft Support
Note: Your Microsoft business or technical support engineer may collect information from alternate email addresses to help with the verification process.
Thank you in advance for your understanding. Your patience and cooperation will be greatly appreciated. I hope for all the best!
Sincerely
Kerry Chen | Community Moderator
