Make sure in the Basic Station configuration that there are no hidden spaces before and after port number, URI etc - as this will through it off, also make sure you have wss:// at the beginning of the URI, such as wss://au1.cloud.thethings.network OR wss://eu1.cloud.thethings.network for example.
Also I am not sure if this is an error in the RAK guide but the the section for the Client Token looks wrong to me - but I am not sure of the consequence of the difference, I’ve seen it mentioned on another post (that spans few years for RAK):
I believe the Client Token section should be formatted like:
Authorization: Bearer NNSXS.xxxxxxxxxx//
instead of just:
See if that helps, by pressing save/update I believe the Basics Station restarts - see what it then says in the TTN console after making this change.