ExpressLRS backpack Mavlink connection troubleshooting

Greetings

I am using jumper T14 and pixhawk 2.4.8 flight controller.

I followed the wiki and everything is setup accordingly.

I have the basic understanding of expressLRS now

Rx TX are flashed and bind successfully
backpack is flashed successfully
Lua script installed

The problem:

If I use the external LRS TX ( happymodel 900 ).

In the lua script when I go to the backpack menu the on and off switch is not visible and I cannot see any WiFi hotspot on my laptop to connect to it even though I set telemetry to WiFi
Other devices ( RX ) is set to mavlink and TX link mode is set to mavlink.

If I use the internal LRS

From the lua script menu I can’t see link mode option to change it from normal to mavlink، However in the backpack menu I can see the on and off switch but not the telemetry option to change to mavlink.

Any idea what’s going on here ?

I am trying to connect to mission planner through the LRS backpack.

In mission planner I changed some parameters according to the wiki