Do you mean 2 Misc devices a/o 2 DDA+ USB sticks in 1 bike?
Nope. not more than 1 DDA ‘device’ (only!) physically connected and paired/ registered by dealership as well.
DDA+ USB stick connects to the same under the seat CANBUS connector the Ducati Diagnosis System (DDS?) from dealership is connected to when serviced for updates/ checking faultcodes.
Via Bluetooth DMS module wireless upto 5 devices for Music, Calls, Messages and Linkapp data only.