Can't pass business verification and contact support

I have very similar story.
I have reached a complete dead end with the process as well. 
Document Uploaded: Domain purchase invoice showing business name, address, and domain ownership.
Verification stuck as “Rejected” with no option to upload additional documents.
Clicking “Fix now” does nothing — it only refreshes the page.
Impossible to submit a support ticket via Partner Center.
The support form either loops or fails to show a “Submit” option.
Calling Microsoft support numbers redirects to community forums.
No human escalation channel available through standard support workflows.
I purchased Microsoft 365 Business specifically to enable OAuth2 integration and Entra ID reporting for my business application.
Partner Center verification is a required step, but the platform is blocking progress with no visible escalation path. Extremely frustrating.