BTech Pro only sends a position report with your call sign, no messages. It is more like a MDC function then APRS. I'm also a APRS user going all the way back to my first which was a Kenwood TH-D7A(G) along with a TM-D700A
I'm a ham also, use more then one radio when in the car. Also have FTM400XDR, FT5D, Kenwood THD74A, Raddioddity DB20, Anytone 878UVII+. and a SDRPlay R1A . Always have options
Make sure Radio Certification Type is set to none in the cps. I learn unless it is a certain type of battery, the radio goes into a hissy fit if it is set to UL