Try the below:
First delete all missions in DJI Fly.
Then connect your RC Pro 2 to windows, open file explorer on your PC, and navigate to RC Pro 2\Android\data\dji.go.v5\files
Delete the entire ‘waypoint’ folder
Then follow the guide at [GUIDE] How to use Litchi Hub with DJI Fly / SkyRover
Should work without any issues