I'd be curious as to what is failing in your PAPR report? The uAvionix units typically fail with either Mode 3A or Baro Alt. When they fail with those errors, it's typically due to poor radar coverage not causing your transponder to reply. If the transponder doesnt' see an interrogation,it doesn't reply (transmit), so the uAvionics device doesn't get updated squawk and Barometric Altimeter. When you fly the plane somewhere that has good radar coverage, the unit will pass the PAPR reports. When you're in an area with sketchy radar coverage, it will consistently fail the PAPR reports. They don't seem to have a fix for the TSO tip and tail beacons other than to say the FAA is usually lenient about those failures. I have found otherwise, so didn't accept that answer. With the uAvionix Echo UAT (Experimental only), I was able to connect the ADS-B device directly to a serial line on the transponder (Sandia STX-165) so the device would always have updated Baro Alt and Squawk. Unfortunately, I don't think that is possible with the TSO tip and tail beacons.
Some other vendors have another transmitter in their units to interrogate the transponder roughly once a second, which will cause the transponder to reply once a second, which will allow the ADS-B device to read updated data from the transmissions. In short, the uAvionix units will only pass the PAPR reports if you fly where you have decent radar coverage. If not, they typically fail.
-Cub Builder