Hi Rob,
Just a quick update. This does not appear to be an issue with DELL ESSENTIALs. It appears that the version of Windows we are using is not recognised by the OMSA itself. This is being worked through a Pro Support case number with Dell Pro Support (I though this may be better than attempting to work on via the forum).
We upgraded to OMSA 7.2 on a number of machines and still had the issue.
I'll let you know how I get on so info can be shared...
Thanks
Alan.