Background
I am a novice with SEPM. However upto now I successfully installed and updated the system with no issues.
The group of clients and SEPM are on a totally offline domain of ~30 computers.
SEPM manager is a seperate PC from domain controller & server.
SEPM computer is running Windows 7 x64 SP1 ' out of the box '
SEPM was 12.1.5, just updated to 12.1.6 MU10.
Clients are either XP or Windows 7 SEP running client 12.1.5 ( 12.1.5337.5000 ) basic antivirus only installed by remote push.
Problem
New client with Windows 10 ver 1803 x64 installed. This client, like all others, has been given a unique name.
Could not install SEP by remote push then read that SEPM upgrade to 12.1.6 MU10 required. Temporarily client made standalone with virus definitions installed locally.
SEPM now upgraded to 12.1.6 MU10. Existing clients seen in manager groups after upgrade and virus definitions distributed as with SEPM 12.1.5
Uninstalled SEP from new Windows 10 client and tried to install SEP 12.1.7445.7000 by remote push. At ' Computer Selection Screen ' client seen. Login credentials entered but ' Testing Connection ' failed ' The client cound not be installed on the remote computer '. Firewall on client is turned off.
Package created and installed on client. Client can see SEPM, has green dot and virus definitions update. However client not seen in SEPM group. Communication package ( Sylink file ) created in SEPM and installed on client but issue remains.
SEPM knows client exists as licence taken. Also if in SEPM from the group ' Add computer account ' selected and the popup box filled in SEPM states ' There is already a computer with same name and domain in the group ' .
Any advice to resolve this will be appreciated.