Error setting variable - 'recovery-boot-mode': (iokit/common) not permitted

[Guest TECK]

Running Monterey 21.1 with OC 0.7.7 and I get this error:

Code:

 

$ sudo nvram "recovery-boot-mode=unused"

Error setting variable - 'recovery-boot-mode': (iokit/common) not permitted.

 

Any idea what is causing this error message? Is for my learning experience, in older OS I don't experience this.

 

Source: MacRumors