Windows Defender is not performing its recommended actions on threats

I'm running Win 10 Home, 10.0.19045 Build 19045 (22H2). Fully updated. At least it should be since it nags me every 2 weeks or so.
Defender didn't remove the items. So I booted to safe mode and removed the WindowsDefender\Scans\History\Service.

A MVP told me to delete the entire contents of this folder but the Scan results wouldn't delete.

I deleted what I could, rebooted, did an offline scan, rebooted again and now I'm right back where I started.

Any help is always very appreciated!
KF

Although I'm the admin of this PC, I do not have permission to access these files.

To Clear Defender History is absolutely no solution for the problem!

Pentagon said:

To Clear Defender History is absolutely no solution for the problem!

Is the solution a secret?

for s.o. who fixed it probably not. But I never had such a prolem so that I want to avoid suggestions. I know that Sudo can delete History Files but why do you want to delete a history file from October last Year when that doesn't have any influence on the current problem.

Pentagon said:

for s.o. who fixed it probably not. But I never had such a prolem so that I want to avoid suggestions. I know that Sudo can delete History Files but why do you want to delete a history file from October last Year when that doesn't have any influence on the current problem.

Because it contains the detection of a threat from yesterday's scan. The 26th. I did a Sophos and a ESET scan. ESET found 6 items but none of them are the one from yesterday's scan.