RSSI not properly reporting

Flashed an Omnibus F4Pro w/ Arudplane. Using Ublox GPS and FrSky X8R Rx. So far things are falling into place, however RSSI is not properly reporting in the OSD.
For my iNav setups, I would configure a channel for RSSI, configure the input for that channel and set some weights and offsets and it work.
Trying that same approach in Arduplane it is showing 21 or 22 for RSSI and doesn’t change when I move around.
Any ideas?

Check your dataflash logs to rule out the ground station. I had an issue recently where Mission Planner wasn’t displaying RSSI values.