I'm currently play TNP limitless 7. I can not use the wireless transceiver on my server but I can on singleplayer. basically what happens is when on my server I try to add a channel it will not add it just disappears. but if I try it in singleplayer the channels are added. I've also tried inside and outside of claimed areas.

Minecraft version: 1.20.1
Mod Version: 5.0.5

I am experiencing the same thing. I noticed in Singleplayer I can also not delete any of the channels I created.

Just another thing I thought I should point out.

I am playing ATM9 there it works on my server, but I can confirm the problem with the delete button, it does not work.

Can you provide reproduction steps on a fresh world?

I tried to replicate this and I'm able to delete channels

Correction, I was able to reproduce a delete button issue where if you press the button, it isn't removed from the list, instead you need to close the menu and reopen it for it to be deleted.

I will push a fix for that issue soon