Hey @meaton,
Do you have any suggestions about how to investigate this issue? I'm trying to verify a domain, where I've made the downloaded file accessible publicly, if I test the URL displayed under "We’ll look for your file at the following location:", it works, and returns the content.
But when I try to verify, I get the error message "Domain verification failed.", and no other details. Is there any way to find out more about what's going wrong? (I've checked that the URL https://www.kayak.com/.well-known/apple-developer-merchantid-domain-association.txt is publicly accessible, the cert is using SHA256, and TLS 1.2 is supported)