We don't currently support setting that preference via policy.

Are you trying to turn it off?

Thanks for the reply. No I want to enforce it with value 2 and disable it for the user. So user wouldn't be able to change the value.

Like I wrote in your other thread.

• https://support.mozilla.org/en-US/questions/1479526#answer-1695426

I don't think that you can modify security.cert_pinning.enforcement_level via GPO or policies.json, that would only leave autoconfig as a possible way. Only a few security prefs can be accessed via GPO.

The security team was wondering why you wanted to change it to that particular value.

"It only affects a small subset of sites that are only going to get smaller once we ship certificate transparency."