https://social.technet.microsoft.com/Forums/en-US/44fc841c-3e39-49c1-b1a0-a633c76e2796/win10-build-1803-clients-monthly-cumulative-update-not-offered-may-2018-kb4103721?forum=winserverwsus
"Oops, they did it again..." Microsoft proves once more that they don't care about WSUS - it can be safely assumed that they don't test with it.

Incredible. PLEASE UPVOTE THE TECHNET THREAD, so Microsoft becomes aware.
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