WSUS | client error 80244010

Don’t worry.
It’s a stupid bug.
https://blogs.technet.microsoft.com/sus/2008/09/18/wsus-clients-fail-with-warning-syncserverupdatesinternal-failed-0x80244010/
Do it again. And again. And again. :)
It will work at some point.
;)

OR

do

 gpupdate /force

and reboot.