Fpv drone bound to radio but doesn’t fly or show up in betaflight

[Satpreet.d]

I’m new into fpv and I bought the mobula7 with elrs version but since I have a radiomaster boxer 4in1 protocol so I bought a RadioMaster - R81 2.4GHz 8ch Frsky D8 Nano RX and bound it to to radio it says telemetry recovered but it doesn’t fly or show up in betaflight. It was a sbus so I soldered the gnd to the vtx gnd, the positive to 5v, and the sbus to rx2. I have the uart 2 serial Rx switch on and i changed to configuration to serial rx and sbus as well but I don’t know what I’m doing wrong.