NRF24L01+ modules does not switch roles

[cmavc]

Hello Everyone,
I am trying to use this library for data transmission between two quads. I followed the tutorial in this video here:
https://www.youtube.com/watch?v=tB_GebqaGas
Meanwhile the library had a problem with the max speed, I've found the solution in the issues so after I fixed that it worked like a charm.
But now there is a new problem, I was using one module as TX and the other one RX but I want to switch the roles between my two radio modules.
I tried to use the TX as RX and RX as the TX but the new RX did not receive any data. I don't know how to fix this, its the same example code I use. I attach the images (sorry, some print statements are in Turkish)

One more thing, I want to take this further ahead and communicate between 3 RPis do I have to open up a new pipe or is it okay if I use the same pipe but change the channel? Thank you very much.

Best Regards.