Have you had a look at https://www.bitdefender.com/support/bitdefender-system-extension-blocked-on-macos-high-sierra-(10-13)-2234.html?

We deploy a PPPC config profile for the necessary bits of the BD app. This reminds me that I need to update ours for the additional component:

https://www.bitdefender.com/support/how-to-allow-full-disk-access-to-bitdefender-endpoint-security-for-mac-in-macos-mojave-(10-14)-and-later-2273.html

HTH.

Hi @stcatherines

try this, though its still tricky, looks like the configuration profile needs to be deployed before update!
https://www.bitdefender.com/support/bitdefender-endpoint-security-for-mac:-how-to-configure-jamf-pro-for-macos-big-sur-11-0-and-later-2661.html

That did the trick for me. Thanks.