I am having similar problem. In my case, the update stops at 71%. I contacted Microsoft Support and they did try to use different options (Using Media Creation Tool as well as Windows.iso) but the updates failed. For the last few days, I am getting automatic updates and the same errors occurs. It is very frustrating and I have wasted so many hours during the last few months. I have decided to stop the automatic updates. I tried to stop the automatic updates from Services but that did not work even though update was disabled. I am not sure if this would work.
I hope that it does. The windows version on my pc is 1909.