Since yesterday I am aware of problems with Windows Defender Beta 2 on non-English Operating Systems :-(. That is all I know at the moment. We are working on it and I will keep you posted as soon as I know more
My Defender won't update
"...haven't been updated in 22 days"
WD "...haven't been updated in 22 days"
This issue has been resolved for me since yesterday ;-).
I'v got the def. updates for WD over AU.