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E5 Sandbox authenticator connection lost

Harrison, Nick 0 Reputation points
2026-05-20T10:25:49.92+00:00

I have an E5 Sandbox in Microsoft 365 Developer Program through my visual studio subscription. When I try to login to the sandbox it asks me to respond to the notification in Microsoft Authenticator but no notification has been received in authenticator

Microsoft 365 and Office | Development | Microsoft 365 Developer Program
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  1. Michelle-N 16,635 Reputation points Microsoft External Staff Moderator
    2026-05-20T11:03:39.7266667+00:00

    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

    Hi @Harrison, Nick

    Because you are the sole administrator of your organization, 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".  

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  2. AI answer

    2026-05-20T10:26:04.9166667+00:00

    Follow these steps to restore access to the E5 sandbox when Microsoft 365 asks for an Authenticator notification but none appears:

    1. Check whether the notification went to another device
      • If Microsoft Authenticator is still installed on an old phone, the push may be going there instead of the current device.
      • If you still have the old device, open Authenticator on it and approve the sign-in.
      • Then remove the old device from your sign-in methods in your account security settings so future prompts go to the correct phone.
    2. Fix missing or silent notifications on the current phone
      • Make sure the phone is online (try switching between Wi‑Fi and mobile data, and ensure Airplane mode is off).
      • Open Authenticator → Settings and confirm:
        • App updates are enabled and the app is up to date.
        • Battery optimization is turned off for Authenticator.
        • Notification Settings → Show notifications is turned on.
      • In the device’s OS settings, verify:
        • Notifications are allowed for Authenticator and not set to silent.
        • The phone is not in Do Not Disturb/Quiet mode.
      • If notifications work for some accounts but not this sandbox account, remove that account from Authenticator and add it again, allowing notifications when prompted.
    3. Address “Authentication did not complete” behavior If the sign-in page shows or implies “Authentication did not complete,” check:
      • Authenticator app is unlocked when trying to approve.
      • Device date and time are set correctly (prefer automatic time).
      • Authenticator is on the latest version.
      • Network is stable; retry after toggling Wi‑Fi/mobile data.
    4. Try an alternate verification method (if configured)
      • On the MFA prompt, look for options like “Use a different verification option” (e.g., SMS, phone call, or code from the app) and use that to sign in, then review and fix the Authenticator setup for the sandbox account.
    5. If no alternate method works and access is blocked
      • For a Microsoft 365 Developer E5 sandbox tied to a tenant where you are the admin, and if all admin accounts are locked behind Authenticator with no other methods, a reset by Microsoft support/Data Protection team is required.
      • Use the global Customer Service phone numbers and clearly state:
        • This is a business/tenant account (Office 365 for business / Microsoft 365 for business).
        • You are the administrator and have lost access due to Authenticator.
        • You need the Data Protection team to reset MFA/authentication methods for your admin account.
      • If you cannot get to an agent, one documented workaround is to create a temporary trial Microsoft 365 tenant, sign in to that new tenant’s Admin Center, and open a support ticket from there requesting Data Protection assistance for the original developer sandbox tenant. After resolution, cancel the trial to avoid charges.

    Once support resets MFA for the admin account, sign in again, re-register Microsoft Authenticator for the sandbox tenant, and add at least one backup method (SMS, alternate email, or another admin account) to avoid future lockouts.

    References:

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

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