Träwel Swiftly notifications are fixed. My error. Correctly sent the user agent from the app as the Träwelling API demands, but forgot it on the notifications relay. Those requests went out with the standard Go http client user agent. Träwelling rightfully started refusing requests from the relay shortly after the app was approved by Apple, so I didn’t catch it before the app went live. In case any user reads this, you have to logout and login again for notifications to work, because your device has to be re-registered at the relay.