Pre-reqs for Remote Push from SEPM Server

Hi Guys , I am trying to do remote push from SEPM server , on some machines I can push the package fine on others I can't . The error I get is the failed login when I supply the Domain Admin password. OS of machines are Windows 7 majority , 8.1 and 10. SEPM version is 12.1.6 MP3.

Please tell me if I am missing anything from the below pre-reqs for remote push.

1) Disabling Firewall completely or opening required ports

2) Enabling remote registery service

3) Enabling file and printer sharing

4) Disable UAC or enable the Local Account token filter policy

5) Enabling Network Discovery

Am I missing anything ?

Thanks