For the Dronelink app to run properly on a RC Pro, RC Pro Enterprise, RC Plus, Smart Controller, the DJI Pilot App must be Force Stopped. Closing the app by swiping up from the bottom of the screen is not enough.
The app must be Force Stopped by selecting:
Settings > Apps & notifications > DJI Pilot 2 > Force Stop
Step 1 - Open Settings
Step 2 - Open Apps and Notifications
Step 3 - Select App to Force Stop (DJI Pilot 2)
Step 4 - Select Force Stop and OK
To prevent the DJI app from launching on startup:
Settings > Apps & notifications > Auto start application selection > None (or Dronelink DJI).