If you are locked out of your tenant and do not have access to the global admin account, you will need to contact Microsoft Support directly to regain access. Since you mentioned that you are the owner of the company and can verify necessary information, you should reach out to Microsoft for assistance in this situation.
Here are the steps you can take:
- Contact Microsoft Support: You can find the appropriate contact information for Microsoft 365 support by visiting the Microsoft 365 admin center or using the global customer service phone numbers. Since you cannot create a support ticket yourself, contacting them directly by phone will be necessary.
- Provide Verification Information: When you contact support, be prepared to provide any necessary information to verify your identity and ownership of the tenant.
- Request Assistance: Explain your situation clearly to the support representative, including the fact that the only global admin is unavailable and that you need help to regain access to your tenant.
If you have access to another global admin in your organization, you could also ask them for assistance in resetting the admin account or recovering access.
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