Our app Newton Mail (App ID com.CloudMagic.Mail, App Store app 721677994, Team 53X8EK4BSQ) held the com.apple.developer.mail-client entitlement for years. Newton shipped as a default-mail-capable app starting with iOS 14, and our January 2024 App Store distribution profile (release_appstore_com.CloudMagic.Mail) still contains the entitlement. The grant is no longer active. Automatic signing now fails with: Entitlement com.apple.developer.mail-client not found and could not be included in profile. This likely is not a valid entitlement and should be removed from your entitlements file. The Default Mail App capability does not appear on our App ID in Certificates, Identifiers & Profiles, nor in the Capability Requests tab. This looks like the same migration issue described in these threads: https://developer.apple.com/forums/thread/821303 (same error on a years-old grant, fixed server-side by Apple) https://developer.apple.com/forums/thread/806537 (grant only "partially migrated" to the managed capability) What we have tried since July 2026: July 9: emailed the entitlement team. No response. August 31 and September 5: submitted the Default Mail Client request form. No confirmation page or reference number either time. September 13: resubmitted the form and received Request ID L8JM288VBQ. Support case 102959495479: support confirmed we are not currently granted the entitlement. Our follow-ups on September 18 and September 23 got no reply. Phone case 102973381060: the callback was marked "no answer" 44 seconds after we requested it, and the phone never rang. The current App Store version (10.0.94) meets all four published requirements: mailto: is declared in Info.plist, the app sends to any recipient, the mailto handler opens a compose view with To: pre-filled, and the app receives from any sender. Could someone from DTS take a look, or tell us the right channel to get the migrated grant restored? Thank you.