You followed all the steps by Microsoft technet and when u are deploying the app (c) on sccm always getting on waiting for content?
All clients can enroll to the server … you can watch it on the console configmr .. but apps not deploying when u create a collection with mac clients .. WHY?
Make shure that
-All roles are configured on “intranet and internet mode”
-The package distributed to the same DP where u have located the application catalog with HTTPS connections
-All minimum roles needed / right configured + FQDN