Troubleshooting guides
If the validator returns an error, curl the file
From that thread… first thing to try is: add this end of the .htaccess file: Header set Content-type "application/pkcs7-mime"
At Arcascope, we got it to work by adding this to .htaccess within /.well-known
RewriteEngine On
RewriteBase /.well-known/
# iOS
RewriteRule ^apple-app-site-association$ apple-app-site-association.json [NC,L]