Best to my knowledge ssh-copy-id is not working with Dropbear, see comment Dropbear not using SSH keys - #11 by Trimble-tech
the key needs to be moved and configured manually as described in Dropbear not using SSH keys - #2 by Joulinar
Best to my knowledge ssh-copy-id is not working with Dropbear, see comment Dropbear not using SSH keys - #11 by Trimble-tech
the key needs to be moved and configured manually as described in Dropbear not using SSH keys - #2 by Joulinar