SEP Clients not appearing as online in SEPM console when in imported AD group

I am having an issue where my my clients are only appearing as online when they are in a SEP created group.

I have imported the AD structure with all the computers in to SEPM.

When i view the computers in SEPM from the AD group they all apear as offline, but when i copy them in to a New Created SEPM group outside of the AD structure they appear as online....

I have an SEPM AD group with GUPs which are appearing as online as expected, so this issue only appears to be affecting Desktop clients.

Any explination as to why this is happening and how this can be resolved?

Thanks.