As for the errors (please don’t post images for what is just text) the “Join not accepted: denied” only proves that the node did not receive a Join Accept. For that, the network might have silently rejected the Join Request, but it could also have accepted it after which the node somehow did not receive the Join Accept. And the “no_free_ch” just means the node is trying too fast, which you can ignore for now as that would not happen if the join succeeded.
Beware: