I'm implementing a MEMessageActionHandler Mail extension on macOS 26.4.1 (Xcode 26.4). The extension is discovered by Mail and appears in Mail > Settings > Extensions, but Mail shows only an "Uninstall" button — no enable toggle. The MailKit consent dialog asking permission to process messages in the background has never appeared. Console logs show optedIn: NO / userEnabled: Not Enabled. Extension Info.plist (key parts): NSExtensionPointIdentifier com.apple.email.extension NSExtensionPrincipalClass CheckThisMailExtension.MailExtension MEExtensionCapabilities MEMessageActionHandler Principal class: class MailExtension: NSObject, MEExtension { func handlerForMessageActions() -> any MEMessageActionHandler { return MessageActionHandler() } } Entitlements: app-sandbox: true, application-groups: [group.com.xxx]. App is Developer ID signed and notarized. Has anyone successfully gotten the consent dialog to appear for MEMessageActionHandler on macOS 15/26? Is there something beyond the standard template configuration that enables it? Any entitlement that needs to be provisioned separately?