Windows 10: Why won’t Tamper Protection stay on?

I have Windows 10, version 1903.

If I turn Tamper Protection On in “Virus & threat protection settings, Manage settings” and then leave Windows Security, when I come back to it, Tamper Protection has reverted to being Off again? How do I make it stay on? Does it matter?

Also, after “Tamper Protection is off. Your device may be vulnerable.”, what does “dismiss” in blue do/mean?

:)

 

Defender Tamper Protection/1903

Moderators: This thread deals with Defender Tamper Protection setting and 1903. If this would be better served in a different location, please feel free to move the post.

Just wondering if anyone who installed 1903 is having any unusual issue with Defender's Tamper Protection.
Here's the blow-by-blow.....

1. Friend and I were running 1809 and installed 1903 via Update Assistant on Tuesday, May 21st. No issues and Defender Tamper Protection was on (default setting).
2. Two days later, the 23rd, friend gets alert that Tamper Protection is off. She turned it on and it seems to be holding.
3. Today, I get the alert Tamper Protection is off and I turned it on. So far, it's holding.

I have no idea why Tamper Protection would turn off. Both computers are clean -- no viruses, trojans, malware or adware. We do not mess around in the registry and there is absolutely no third-party antivirus on either machine.

For now, I'm taking a wait-and-see if Tamper Protection turns off again. I don't know if it's a 1903 bug or not. Any ideas or suggestions would be appreciated.

 

Defender Tamper Protection/1903

Interesting find. KB4052623 is the update for the antimalware platform and while I never thought to link it to the tamper protection mode, I have found that every time I get one of the antimalware platform updates, Windows Defender's tasks in the task scheduler all revert to "the task has not yet run". Eventually, the tasks start running so that's probably normal behavior. BTW, my tamper protection has stayed on since manually turning it on. Good catch!

 

Tamper protection in 1903?

No. Tamper protection means you can only make changes from within the Windows Security app. You can still turn off real time protection in the Windows Security app while tamper protection is in force.