RealPresence Group 500 Encryption Option Missing

Hi,

We have a number of RealPresence Group 500 devices. Most of these have the encryption option underneath Admin Settings > Security > Global Security > Encryption as stated here -https://documents.polycom.com/bundle/rpgs-ag-6-2-2/page/t-rpgs-ag-configure-encryption.html

However we have one device that does not have this option and as such is unable to join Zoom meetings.

The software version of all devices is - Release - 5.0.0-211246

The only difference between the devices is that the device that doesnt have the encryption option is on hardware version 10, whereas the others are on version 12+.

Could this be the reason why encryption isnt appearing for this device?
Is there a way we can get this to appear and enabled?

Thanks,
Robert