Searched thru post, lots of near misses but no solution to my issue. Only on windows 10 does this problem exist.
I connect office equipment to customers pcs/networks. I use a script to create a hidden/special user that has admin permissions...
MS Defender updates from Windows Update in settings fail, other Updates successful, but MS Defender from Control panel can update the same definition updates without problems (why, oh, why? can't I just select and copy from settings? :()...