A free program from Microsoft that provides developers with the tools, resources, and sandbox environments needed to build solutions for Microsoft 365.
Hello @Leo Li
I’m very sorry to hear that you have spent so much time trying different solutions but are still unable to create a new Microsoft 365 Developer E5 subscription or reach the appropriate support channel because your previous tenant has expired.
In this situation, community forum users do not have access to Microsoft’s internal systems to remove the old subscription association, reset your Developer Program profile, or confirm whether your account is still eligible for an E5 Developer sandbox. Since the expired subscription remains on your dashboard, the issue may need to be reviewed by the team responsible for the Microsoft 365 Developer Program.
I understand that you cannot sign in with your former work or school account and cannot complete the Microsoft 365 Business Standard trial registration. Unfortunately, this means that the previously suggested support routes are not practical in your circumstances.
The only other support source I could find for you, besides the ones mentioned above, is the support option of the Microsoft 365 Developer Program . This is the team that handles Developer Program profiles and sandbox eligibility. I can’t confirm whether it will be accessible in your situation, and one community member reported that a direct support link did not work, so I’d suggest opening it from the Dev Center page rather than from a saved link. If you submit a request, please include the email of your Developer Program account, a screenshot of the expired subscription on your dashboard, any error messages, and that you can no longer sign in with the old sandbox administrator account.
I would not recommend repeatedly creating new Microsoft accounts or using a different phone number solely to register again, as eligibility for the Developer Program is determined by Microsoft and is not guaranteed by changing accounts.
I’m only another user in the community and cannot access or modify your Developer Program profile. I’m sorry that I cannot provide a direct solution from this forum.
Thank you for your understanding.