Edit:
It just finished repair 22579 to 22579 with MS ISO, everything looks fine this time, no loop on W.U. on this one.
Did you refuse updates?
Just did 22579 to 22579 again, this time refusing updates, got the W.U. loop with error c1900401again.
Looks like that option is definitely causing the problem.
Time for another FBH? 😝
You tested that and we both arrived to the same conclusion last week before the thread was deleted. 😁
Why do you keep trying?
Because when I did 22572 to 22579 it got the same bug even allowing to check for updates.
So, it is not just when refusing the updates, something else is causing the same issue.