Individual Microsoft Store developer unable to open support case — Engage Center No Access / infinite loading

Hello Microsoft Support Team,

I have an active Individual Microsoft Store developer account and need assistance correcting a legacy package identity that contains my former legal name.

My legal name and publisher information were updated successfully in Partner Center approximately one month ago.

I recently reserved my first application, which has never been submitted or published. However, its automatically generated Package Identity Name and Package Family Name still contain my former legal name.

I need to contact the Store developer account team to determine whether the legacy account prefix and the application's package identity can be corrected before publication.

Unfortunately, I am unable to submit a support request.

Steps already attempted:

Partner Center → Partner AI Assistant → Raise a support ticket.

Windows Developer Support → Create support case (MSA).

Direct Engage Center login using my personal Microsoft account.

Engage Center → Select workspace → Support for Business.

All support links redirect to Engage Center. It displays "No Access", and selecting "Support for Business" results in an indefinite loading screen.

The Engage Center Help panel contains documentation but no support request option.

Please do not redirect me to the same Engage Center support link, as it is currently inaccessible.

Thank you.