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I want to enable push notifications in my iOS app. I followed the resp. walkthrough as closely as possible. To test things, I tried the command line approach first like described here: https://developer.apple.com/documentation/usernotifications/sending_push_notifications_using_command-line_tools The APNS server responds with 200/OK, but no notification will ever arrive at my device. I definitely assume my request is correct; if I tamper with the device token (e.g. by altering its last digit), the server responds with 400/BadDeviceToken like one would expect. This is what I get from the APNS server: curl -v --header "apns-topic: $TOPIC" --header "apns-push-type: alert" --header "authorization: bearer $AUTHENTICATION_TOKEN" --data '{"aps":{"alert":"test"}}' --http2 https://${APNS_HOST_NAME}/3/device/${DEVICE_TOKEN} *  Trying 17.188.138.73... * TCP_NODELAY set * Connected to api.sandbox.push.apple.com (17.188.138.73) port 443 (#0) * ALPN, offering h2 * ALPN, offering http/1.1 * successfully set certificate verify locations: *  CAfile: /etc/ssl/cert.pem  CApath: none * TLSv1.2 (OUT), TLS handshake, Client hello (1): * TLSv1.2 (IN), TLS handshake, Server hello (2): * TLSv1.2 (IN), TLS handshake, Certificate (11): * TLSv1.2 (IN), TLS handshake, Server key exchange (12): * TLSv1.2 (IN), TLS handshake, Request CERT (13): * TLSv1.2 (IN), TLS handshake, Server finished (14): * TLSv1.2 (OUT), TLS handshake, Certificate (11): * TLSv1.2 (OUT), TLS handshake, Client key exchange (16): * TLSv1.2 (OUT), TLS change cipher, Change cipher spec (1): * TLSv1.2 (OUT), TLS handshake, Finished (20): * TLSv1.2 (IN), TLS change cipher, Change cipher spec (1): * TLSv1.2 (IN), TLS handshake, Finished (20): * SSL connection using TLSv1.2 / ECDHE-RSA-AES256-GCM-SHA384 * ALPN, server accepted to use h2 * Server certificate: * subject: CN=api.development.push.apple.com; OU=management:idms.group.533599; O=Apple Inc.; ST=California; C=US * start date: Feb 8 21:41:22 2021 GMT * expire date: Mar 10 21:41:22 2022 GMT * subjectAltName: host "api.sandbox.push.apple.com" matched cert's "api.sandbox.push.apple.com" * issuer: CN=Apple Public Server RSA CA 12 - G1; O=Apple Inc.; ST=California; C=US * SSL certificate verify ok. * Using HTTP2, server supports multi-use * Connection state changed (HTTP/2 confirmed) * Copying HTTP/2 data in stream buffer to connection buffer after upgrade: len=0 * Using Stream ID: 1 (easy handle 0x7fe09f80f200) > POST /3/device/49C52E009C0107AB0ACCF178703E32790B4F3F155E7897F1F4ABAA3B1D9170D8 HTTP/2 > Host: api.sandbox.push.apple.com > User-Agent: curl/7.64.1 > Accept: */* > apns-topic: de.nexoft.viveto > apns-push-type: alert > authorization: bearer eyAiYWxnIjogIkVTMjU2IiwgImtpZCI6ICJaTTNDR0hTVEQ5IiB9.eyAiaXNzIjogIjNaVzhDUVZEWUoiLCAiaWF0IjogMTYyOTI5NjI1NCB9.MEYCIQCXP7L0-v_wY8F_WGFuZ-phJomzyO-43k0b7Xl9dvosVwIhANErbCHYfnG5ccfKTl14BCEhyWbDzPZSSLkJrSaQhCSb > Content-Length: 24 > Content-Type: application/x-www-form-urlencoded >  * Connection state changed (MAX_CONCURRENT_STREAMS == 1)! * We are completely uploaded and fine * Connection state changed (MAX_CONCURRENT_STREAMS == 1000)! < HTTP/2 200  < apns-id: 4C4AF738-9624-4643-8F76-18FFAD630C4F <  * Connection #0 to host api.sandbox.push.apple.com left intact * Closing connection 0