Im a solo dev how do i get sandbox access i am trying to use the xbox api thru azure

I am a solo developer who paid for the Xbox Developer Program. I have registered my Xbox title and created an Azure app registration (Client ID: 7xxxxxxx-dxxx-4xxx-axxxx-exxxxxxxxxxxxxa). I am blocked from creating or accessing a sandbox in Partner Center, so I cannot link my Azure app registration to my Xbox title or add Xbox Live API permissions (XboxLive.signin, XboxLive.offline_access). Please enable sandbox access for my account and help me complete the Xbox Live API setup. My recent error/correlation ID: 0xxxxxx9-bxxxx-4xxxxx-8xxxx-axxxxxxxb.