The following error message appears while pairing your device in iMazing.
"The pairing between <devicename> and this computer is prohibited by a policy (a Configuration Profile) on the device."
This error appears because your device is Supervised and while preparing its supervision in "Apple Configurator" or via DEP the option "Allow devices to pair with other computers" hasn't been checked.
Enable option "Allow devices to pair with other computers" while preparing a device for Supervision.
Create a new Configuration Profile in "Apple Configurator" or on your MDM platform, select "Restrictions" and enable "Allow pairing with non-Configurator hosts". Then install it on the device.
Please note: To be able to install a Configuration Profile on a Supervised device, you will of course need to own the Supervision Certificate.