Unable to register Amazon Fire stick on Broadlink RM4 Pro , anyhing I could be missing?

I have integrated Broadlink RM4 Pro to Home Assistant . I was able to use Remote: Learn Command and could learn my TV remote successfully . But the amazon fire stick is kind of troubling me , not sure if I am missing something. I could find a right solution w.r.t HA.

I have tried both IR and RF for the remote and none working . From the remote I could configure ( learn) Power, Volume Up , Volume Down and Mute only , rest all aren’t configurable . I am wondering even these four worked because , I use this remote to control those exact 4 commands in general ( there is something with this special HDMI connection, I do not remember what it is) .

Can someone help on it or tips on how I can achieve it?

IIRC, the Amazon remote is a combo IR/Bluetooth.
A limited set of button is IR enabled, as you noticed, for direct interaction with the TV. The others are bluetooth.

Not sure if there is a way to pair the remote with something else than a FireTV stick.

One approach to this is to use your TV’s IR remote to control the firestick. If it has CEC the firestick should be able to receive them (in the stead of the RF on the firestick remote).