Abandoned Microsoft 365 tenant: sole global admin was a former employee, need admin recovery

Hello Myran,

I’m sorry to hear that your organization’s previous administrator left without transferring the required administrative access.

First, could you confirm whether there is another Global Administrator or Billing Administrator in your organization? You may ask any important people in company try accessing Admin center.

In such a situation when there is no other global administrator, only the Microsoft Data Protection Support team can assist in resolving that issue to regain access. As you shared that you have been on call and has been of no success, I would like to share with you tips that would be helpful when contacting the Microsoft Data Protection team via a phone:

Kindly verify if you call a phone number listed here with its respective region:

Contact Microsoft customer support | Microsoft Support

Please carefully follow this instruction to ask for Microsoft Data Protection team support:   

Depending on your country or region. For some countries, when calling the support number, although there are about 30 seconds opening as something "you can visit the link...." But you can ignore this opening and wait until the option, then "1" as a business email user, "1" again for technical help.   

For some countries, it will be an automated conversation like:     

First, when you call the hotline, it asks what kind of problem you are worried about.   

Answered: authenticator.   

A: What kind of product are you using?   

B: Office 365 for business.   

A confirmation: education or company account?

B: For companies   

A: Are you an administrator?

B: Yes.   

A: Do you have the other admin in your organization?

B: No.   

A: You need one.... Service request? 

B: Yes   

In case the phone line is not supportive, you can consider directly submitting a support request as a helpful workaround: Consider signing up for a trial subscription to create a new tenant. Visit Microsoft 365 Business Plans and Pricing | Microsoft 365. 

Once the new tenant is set up, you can access its admin center and submit a support ticket through Microsoft 365 admin center > Support > Help & Support to contact the Data Protection team.

Please remember to cancel the trial subscription after your issue is resolved, as this will help you avoid any accidental billing. You may prefer the following resource for detailed instructions: Cancel your Microsoft business subscription in the Microsoft 365 admin center | Microsoft Learn 

I hope this helps point you in the right direction. If you have any updates or additional questions, feel free to reply back and I'll do my best to assist further.