Flere påloggings- eller kontorelaterte problemer i Microsoft Teams for bedrifter
(This is a Norwegian forum, but I noticed that you originally posted your question in English, so please allow me to reply in English to make the discussion easier and smoother for us. Also, since my test environment uses the English interface, the screenshots will appear in English. Thank you for your understanding!)
I understand your situation. Just to gently clarify before going any further, this forum is separate from Microsoft Support. Forum users, moderators, and Microsoft external staff cannot access user accounts, verify tenant ownership, or directly escalate cases to the Data Protection team. Because of that, any tenant recovery request must ultimately be handled through Microsoft's official support channels.
If you've been unable to reach support successfully by phone and cannot create a support request from the affected tenant because no administrator account is available, one workaround that has helped other users in similar situations is to create a new Microsoft 365 trial tenant: Microsoft 365 Pricing for Business: Plans & Features
Once the new tenant is created, you’ll be able to sign in to the Microsoft 365 admin center and submit a support ticket from there. In your request, clearly explain that you need help with regaining access to an administrator account in your original tenant and ask to be routed to the Data Protection team. This approach typically ensures that the ticket is properly assigned and handled by a real support engineer rather than remaining stuck in automated flows or disconnected mid-process.
If Microsoft's ownership validation is successful, the responsible team may be able to assist with restoring Global Administrator access or providing the next steps required to regain control of the tenant.
Note: Please remember to cancel the trial subscription once your issue is resolved to avoid any unintended charges
I hope you're able to give this approach a try and that it helps you successfully create a support ticket and reach the appropriate team to resolve this issue. Thank you for taking the time.