You have Item Level Targeting enabled (A GREAT thing - don't disable it - harness it!)
https://www.ajtek.ca/wsus/how-to-setup-manage-and-maintain-wsus-part-2-computer-groups-update-views/
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I setup a new WSUS, all computers are under 'Unassigned Computers', I created new computer groups, but I can not move the computers from 'Unassigned Computer' to my new computer group, when I right click on the computer. The option is 'greyed out', Why?
You have Item Level Targeting enabled (A GREAT thing - don't disable it - harness it!)
https://www.ajtek.ca/wsus/how-to-setup-manage-and-maintain-wsus-part-2-computer-groups-update-views/
Thank you, Adam.
In options>computers the 'use group policy or registry settings on computers' was selected. I changed that to ' use the update services console' and the change membership option became available. Thanks