Deactivate AirTag via MDM

Is there a Setting to deactivate the usage of airtags ?

Considering it’s part of the Find My app I would look at disabling allowFindMyDevice under restrictions. (Untested)

Disables Find My Device in the Find My app. Requires a supervised device. Available in iOS 13 and later.

Note: You would also want to test a rogue AirTag being found by a device with Find My disabled.