Same issue for our team since at least 2026-08-24. Team ID R58645RRYR, client ID com.amenscroll.amenScroll (primary App ID, native app, no Services ID, no grouped App IDs). The sheet renders, the user approves, then "Sign-Up Not Completed". akd shows AKSQLError -6003, "No applications were found with the provided Client ID", GrandSlam postdata HTTP 401, and SRP fails with "M2 missing (bad password)" despite a correct password. Entitlements verified in the signed binary and embedded provisioning profile; APPLE_ID_AUTH with PRIMARY_APP_CONSENT confirmed via the App Store Connect API; deleting and re-creating the capability had no effect. This also cost us an App Review rejection (2.1a, the button reads as unresponsive). Filed as FB24582063. Requesting the same server-side registration repair applied to the other teams in this thread.