Hi,
Agree with Adam , you may need to wait for a moment to complete reporting (please ensure WSUS server settings in GPO are configured correctly ).
In addition, if you are going to use server 2012 WSUS server to serve window 10 client , you may install
the KB3095113 and KB3159706 patches
on the WSUS server.
(Note, KB3159706 contains some manual operations)
Then, syn and download updates .
Best Regards,
Elton
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