Listing Apps Not Working

Question

Had a partner center account that was created with no previous tenant associated. Wanted to automate releases.

Followed the steps here: https://learn.microsoft.com/en-us/windows/apps/publish/partner-center/create-new-azure-ad-tenant
then here:
https://learn.microsoft.com/en-us/windows/apps/publish/partner-center/associate-existing-azure-ad-tenant-with-partner-center-account.

Then followed guide here and created and app registration aka Service Principal in new azure ad tenant https://learn.microsoft.com/en-us/windows/uwp/monetize/create-and-manage-submissions-using-windows-store-services

Then tried to list applications using the call https://manage.devcenter.microsoft.com/v1.0/my/applications found here https://learn.microsoft.com/en-us/windows/uwp/monetize/get-app-data

I get {'value': [], 'totalCount': 0} as the json response. No apps listed. I have 5 apps in partner center.

Am I missing something?