Verify applecdn is available。 curl -v https://app-site-association.cdn-apple.com/a/v1/YourDomain eg. fail request curl -v https://app-site-association.cdn-apple.com/a/v1/www.123.com * Trying 59.108.139.130:443... * Connected to app-site-association.cdn-apple.com (59.108.139.130) port 443 (#0) * schannel: disabled automatic use of client certificate * ALPN: offers http/1.1 * ALPN: server accepted http/1.1 * using HTTP/1.1 > GET /a/v1/www.123.com HTTP/1.1 > Host: app-site-association.cdn-apple.com > User-Agent: curl/8.0.1 > Accept: */* > * schannel: remote party requests renegotiation * schannel: renegotiating SSL/TLS connection * schannel: SSL/TLS connection renegotiated * schannel: remote party requests renegotiation * schannel: renegotiating SSL/TLS connection * schannel: SSL/TLS connection renegotiated < HTTP/1.1 404 Not Found < Content-Type: text/plain; charset=utf-8 < Content-Length: 10 < Connection: keep-alive < Server: nginx < Date: Mon, 03 Jul 2023 07:50:28 GMT < Expires: Mon, 03 Jul 2023 07:50:38 GMT < Age: 2774 < Apple-Failure-Details: {"cause":"dial tcp: lookup www.123.com on 10.100.53.53:53: no such host"} < Apple-Failure-Reason: SWCERR00304 DNS error < Apple-From: https://www.123.com/.well-known/apple-app-site-association < Apple-Try-Direct: true < Via: http/1.1 jptyo5-vp-vst-010.ts.apple.com (acdn/87.14301), https/1.1 jptyo5-vp-vfe-008.ts.apple.com (acdn/87.14301) < X-Cache: MISS KS-CLOUD < CDNUUID: 6a2ef8f4-e479-4204-8d60-7407afe5597a-2780390327 < x-link-via: bjfd01:443;xymp07:443;gzun11:443;xg02:443; < x-b2f-cs-cache: no-cache < X-Cache-Status: MISS from KS-CLOUD-XG-02-08 < X-Cache-Status: MISS from KS-CLOUD-GZ-UN-11-09 < X-Cache-Status: MISS from KS-CLOUD-XY-MP-07-08 < X-Cache-Status: MISS from KS-CLOUD-BJ-FD-01-11 < CDN-Server: KSFTF < X-KSC-Request-ID: 5f040404d3ae915ce539ef3ae0c5840d < X-Cdn-Request-ID: 5f040404d3ae915ce539ef3ae0c5840d < Not Found * Connection #0 to host app-site-association.cdn-apple.com left intact < HTTP/1.1 404 Not Found this is origin domain error you need check your domain curl -v https://YourDomain/apple-app-site-association --header 'User-Agent: AASA-Bot/1.0.0' AASA-Bot is apple cdn header. If successful, the correct result is returned to you < { "applinks":{ "apps":[ ], xxxxxxxxx }* Connection #0 to host xxxx left intact