A free program from Microsoft that provides developers with the tools, resources, and sandbox environments needed to build solutions for Microsoft 365.
Phone numbers are uniquely associated with a single Microsoft 365 Developer Program profile. Once a phone number has been used, it remains linked to that profile, even if the account was created with a work email that you no longer have access to.
Please note that Microsoft Q&A is a public, user‑to‑user support forum. As a forum moderator, I do not have access to internal Microsoft systems and am unable to locate, release, or unlink phone numbers from Microsoft 365 Developer Program profiles on behalf of users. Here are the supported options available to you:
- If you still have access to the old account, you can try logging into the Dashboard - Microsoft 365 Dev Center using the account that may have been used previously and delete the old profile. After deletion, the system may take up to 60 days to release your phone number so it can be reused for a new registration.
- If you no longer have access to the original profile, I recommend contacting Microsoft Developer Support through the following link: Services Hub. Please note that this portal (Services Hub) is a paid ticket and access is subject to certain conditions, which you can review here: Services Hub sign in FAQs | Microsoft Learn.
- If you need to complete registration immediately, using a different phone number is currently the only guaranteed way to proceed.
Kindly let me know how you get on, as your feedback can help others in the community facing the same problem.
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