Can you test the code from this example of NRF24L01 communication
(post is in French but code is code)
- install each code on each arduino
- open a Serial monitor for each arduino (so you need a terminal application as the IDE can only open one)
- whatever you type on one side should appear on the other side
➜ if that works then you know your setup is likely OK. (which is likely not unless you have a cap to answer to peak demand when transmitting and your Tx might require to be changed from 5V ➜ 3.3V to not burn your module).