That’s a later firmware than I just upgraded to (93.8.5.21), must be new. Still, shouldn’t be an issue.
LNS server is correct.
The app note got changed to printf "Authorization: Bearer NNSXS.xxxxx\n">tc.key but I still think that’s wrong.
That should be {CR} or \r or ASCII DECIMAL 13 or HEX 0D. I’ve hexdump’d my tc2.key file and it definitely ends in 0d 0a
There was an error in the log somewhere about this when I had the wrong line ending. Of course I can’t remember it though, sorry.
So I’d try making a tc3.key file (to avoid any latent filename bug, but that’s possibly fixed) and try again?