The Pegasus PPB connect to my Mac , just tried.
Under Indi Control Panel, what does it show you for System Ports? - For example mine shows /dev/cu.Bluetooth......,/dev/cu.usbseria-004014 and /dev/cu.usbserial-PPB3Gxxx
For my PPB, it connect using /dev/cu.usbserial-004014, 9600 baud. Not the PPB one.
Make sure you Refresh - ScanPorts, and turn off Auto Search until you get a connection. You may have to shut down Kstars and restart for every attempt. When it connects, save settings. Auto-connect will then work if selected with that profile.