Interesting investigation, checked all things - but facing same issue. following input: iPhone 7+ iOS 15.5 push notification and background refresh is allowed from app battery is 100% ( low-power mode not activated ) Background modes checked: background fetch, remote notification Push capabilities added (Remote notification, Background processing, Background fetch) postman requests successful - 200 in response, but not trigger didReceiveRemoteNotification: `{ "to": "{{fcmToken}}", "yourCustomKey":"1", "aps":{ "content-available":1, "apns-priority":5, "sound": "", "apns-push-type":"background", "badge":0} } { "to": "{{fcmToken}}", "yourCustomKey":true, "aps":{ "content-available":true, "apns-priority":5, "sound": "", "apns-push-type":"background", "badge":0} } { "to": "{{fcmToken}}", "yourCustomKey":true, "aps":{ "content-available":true, "apns-priority":5, "sound": "default", "apns-push-type":"background", "badge":0} } ` and even that doesn't trigger didReceiveRemoteNotification Listing 7-1 shows an example of a JSON payload for a background update notification.  developer.apple.com { "to": "{{fcmToken}}", "aps" : { "content-available" : 1 }, "acme1" : "bar", "acme2" : 42 } Nothing from requests above works. Yes I did reload iPhone Any suggestion?? Hot to t-shoot next?