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Lost Global Administrator Access to Microsoft 365 Developer Sandbox

Anh Nguyen 0 Reputation points
2026-05-17T13:45:46.6166667+00:00

I lost access to the Global Administrator account for my Microsoft 365 Developer Sandbox.

Tenant domain: 7mrbvl.onmicrosoft.com

The admin account [Moderator note: personal info removed] @7mrbvl.onmicrosoft.com no longer exists, and I cannot access the tenant.

Could you help me recover admin access or reset the sandbox?

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Microsoft 365 and Office | Development | Microsoft 365 Developer Program
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  1. Jayden-P 22,475 Reputation points Microsoft External Staff Moderator
    2026-05-17T14:31:18.6266667+00:00

    Please note that we're not Microsoft support, this is a user-to-user support forum. Moderators have no backend access and cannot directly intervene in Microsoft products. We provide only technical guidance and best-practice recommendations based on reported issues. Therefore, we're unable to recover admin access or reset the sandbox for you.

    Please note that our forum is a public platform, and we will modify your question to hide your personal information in the description. Kindly ensure that you hide any personal or organizational information the next time you post an error or other details to protect personal data.

    Hi @Anh Nguyen

    From the details you described, I understand that you have lost access and are now locked out of your sole admin account for your Developer E5 tenant.

    In this situation, there are two official paths you can take to regain access to the tenant:

    1.Please visit the following page and reach out to phone number via: Customer service phone numbers - Microsoft Support

    From what I know, you will need to get past the initial AI system to reach the live support team. You can refer to the guide below for tips on how to get through more easily:User's image

    2.If method 1 is not working, please follow this link to create a trial tenant: https://www.microsoft.com/en-us/microsoft-365/business/microsoft-365-business-basic?msockid=3eb6980b5c6860e63a588d0c5d1761d6 - after that you will be able to access to Microsoft 365 Admin Center to raise the ticket

    Assuming that you have already created an account after registering a free trial and you can go to Microsoft 365 admin center and click "Help & support" icon to raise your ticket. The agent will be able to create a ticket for you under the affected tenant and then transfer this ticket to Data Protection team who could help you to regain access.     

    User's image User's image

    Please mention that you are raising ticket on behalf of the affected tenant that you do not have access to. The support team will help you to create ticket on the affected tenant then later on the Microsoft Data Protection team will assist you.

    Note: This process will take more time than usual (7-14 working days) for your account to get access again as Data Protection is always overwhelmed with the number of tickets. As I am forum moderator, I do not have access to Microsoft internal system to assist or push this process to be quicker.

    On the other hand, if you do create the trial and it resolves the issue, please remember to cancel the subscription afterward to avoid any related charges. 

    I hope my information is helpful. Please give me any updates once you get this resolved.

    If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".  

    Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

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  2. AI answer

    2026-05-17T13:46:06.57+00:00

    Admin access to a Microsoft 365 tenant, including a Microsoft 365 Developer Program sandbox, can only be recovered through the standard Microsoft account and tenant recovery processes and Microsoft 365 support.

    For this scenario:

    1. Confirm the sign-in account
      • Go to the Microsoft 365 admin portal at https://admin.microsoft.com.
      • Try signing in with any email addresses previously used for the Developer Program or sandbox.
      • If prompted to request admin access, follow the on-screen steps.
    2. Recover the Microsoft account, if applicable
      • If the issue is that the username or password for the Microsoft account is unknown or not recognized, use the Microsoft account recovery tools:
        • If the password is forgotten, use the Reset your password flow.
        • If the username/email is forgotten, use the Forgot my username / Look up your Microsoft account flow.
        • If the username is reported as not existing, use the Sign-in Helper tool to troubleshoot and confirm whether the account still exists.
    3. If the tenant admin account truly no longer exists or can’t be recovered
      • Tenant ownership and access decisions (including recovering or reassigning a global admin) are handled only by Microsoft 365 support / Data Protection teams.
      • Open a support request for tenant access recovery:
        1. Go to the Microsoft 365 support page and choose I can't sign in or access my tenant.
        2. Provide required identity and organization ownership documentation (for example, business documentation or domain ownership) when requested.
      • If locked out of the tenant and unable to use the portal, contact Microsoft 365 support by phone (Global Customer Service) and ask to be routed to the Microsoft 365 Data Protection team for tenant access recovery.
    4. Developer Program–specific notes
      • The Microsoft 365 Developer Program itself cannot bypass identity verification or directly restore access to an existing tenant. All recovery is done via Microsoft 365 support and the Data Protection team.
      • If the sandbox cannot be recovered and support confirms that access cannot be restored, use the Microsoft 365 Developer Program dashboard to set up a new instant sandbox subscription.

    These are the only supported paths to regain global admin access or reset a Microsoft 365 Developer sandbox tenant.

    References:

    AI-generated content may be incorrect. Read our transparency notes for more information.

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