Update 2: After updating the System to macOS 15.0.1, it works in Mac Catalyst too.
No changes in code or configuration.
I'm worried it might break in production without us knowing why. Not great.
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Update:
It's now working in iOS on device (no clear understanding why it failed before – we didn't change a thing).
It still fails in Mac Catalyst with the error
Application with identifier <...> is not associated with domain <...>
Disappointed by Apple Technical Support here: no response, no help, just silence. :-/
Here's our configuration.
webcredentials:ourdomain.tld?mode=developer
https://ourdomain.tld/.well-known/apple-app-site-association
{
"webcredentials": {
"apps": [
"XXXXXXXXXX.our-app-bundle-id"
]
}
}
Things we double-checked:
Tried the Xcode configration with and without ?mode=developer
The SSL certificate on our server is valid
There are no HTTP redirects
The reponse's Content-Type is application/json
Apple's CDN returns the correct JSON file
The JSON is valid
'sudo swcutil verify -d ourdomain.tld' returns the correct entry for the App ID
There is no typo in the App ID, it's identical to to what the system is mentioning in the error message.