Store Analytics API: 401 "User Unauthorized due to AMS call failure" on installs/acquisitions/funnel, ratings works

I publish a Windows desktop app (MSIX) in the Microsoft Store and read its numbers with the Microsoft Store analytics API, using an Entra ID app with client credentials (resource https://manage.devcenter.microsoft.com). The token request succeeds.

Results on 2026-10-15 for the same token and the same applicationId:

• GET /v1.0/my/analytics/ratings → 200
• GET /v1.0/my/analytics/installs → 401 {"error":"User Unauthorized due to AMS call failure."}
• GET /v1.0/my/analytics/appacquisitions → 401 (same body)
• GET /v1.0/my/analytics/funnel → 401 (same body)
• GET /v1.0/my/analytics/desktop/installbasedaily → 401 (same body)

The failure started on 2026-10-12 and does not clear with retries. The same Entra app can create and commit Store submissions without problems.

1. What does "AMS call failure" mean?
2. Does the Entra app need a role or permission beyond what it needs for submissions, for these analytics methods?
3. The Partner Center support page (Engage Center) never finishes loading for my account. Is there another way to open a developer support ticket?

Thank you.I publish a Windows desktop app (MSIX) in the Microsoft Store and read its numbers with the Microsoft Store analytics API, using an Entra ID app with client credentials (resource https://manage.devcenter.microsoft.com). The token request succeeds.

Results on 2026-10-15 for the same token and the same applicationId:

• GET /v1.0/my/analytics/ratings → 200
• GET /v1.0/my/analytics/installs → 401 {"error":"User Unauthorized due to AMS call failure."}
• GET /v1.0/my/analytics/appacquisitions → 401 (same body)
• GET /v1.0/my/analytics/funnel → 401 (same body)
• GET /v1.0/my/analytics/desktop/installbasedaily → 401 (same body)

The failure started on 2026-10-12 and does not clear with retries. The same Entra app can create and commit Store submissions without problems.

1. What does "AMS call failure" mean?
2. Does the Entra app need a role or permission beyond what it needs for submissions, for these analytics methods?
3. The Partner Center support page (Engage Center) never finishes loading for my account. Is there another way to open a developer support ticket?

Thank you.