Update 18.02.2020: I have gotten some new information that suggests that you might be able to solve this issue not only by enabling the Windows Defender Antivirus service on the client, but also by disabling the Endpoint Protection feature on the SCCM server instead. But since I do not have access to our SCCM server (as stated below) I cannot test this approach myself. Feel free to leave a comment below if this actually works too.
Disclaimer: I am not an expert in all things SCCM. I have not had any kind of training and I have no access to our
local SCCM server at all, not even read-only access. Everything I know is
self-taught from bits and pieces I have picked up here and there. A huge jigsaw
puzzle with lots of holes to fill – not to mention all the pieces I have
dropped under the table by now.
Our
resident SCCM guy has been working on deploying Windows 10 1909 to our clients
for a couple of weeks now and after overcoming an issue (with my help) that
prematurely killed the task sequence (a story for another time) he finally
managed to deploy a system that satisfied the requirements I had set.
But
even before that, he had accidentally deployed the “1909 Insider Preview”
package to a total of seven machines. In addition to those, we had of course manually
upgraded a handful machines to 1909 to test it out or to fix other random
issues with Windows 10 clients here and there.
Right
after the accidental deployment of the Insider Preview version of 1909 we
noticed that the SCCM Software Center was in English, and not our usual German
locale. A repair installation of the SCCM Client fixed that issue.