Partner Center account appears corrupted - tax profile only shows VAT and support case cannot be opened

My Partner Center account appears to be in a broken state.

Issues:

My tax profile only allows me to enter a VAT number. I am an individual and I am not VAT registered.

My tax profile remains blocked because I cannot complete it.

I created a support request (Case ID: 2607010040008563), but when I open it I receive the message: "There was a problem retrieving the support request details."

Because the support case itself cannot be opened, I have no way to communicate with Partner Center support.

I have already:

Registered as an individual.

Tried different browsers and devices.

Created a new Partner Center account.

Cleared cache and cookies.

I believe my Partner Center account needs to be checked by the Partner Center engineering team because it appears to be incorrectly provisioned.

Could someone please escalate this issue and advise how to repair my Partner Center account?