[Grace Baker Moderator November 26, 2019 at 5:49 pm Grace Baker Moderator]

Hey, Thanks for reaching out to us.

Please navigate to iOS–>Advanced Restrictions–>Allow Device Functionality. The ‘Air drop’ option will be listed below.
AirDrop allows iOS devices to transfer data between iOS devices over WiFi or Bluetooth. The option is allowed by default. Please disable the option to prevent the usage of AirDrop

Kindly use the link for reference.

Cheers!
Grace Baker
Hexnode MDM