Ok, the problem is that you alreay have a connection in the IP range the phone can be connected to when using USB. The telnet IP is 192.168.2.15, but you are already connected to a network which uses the same IP range via enp0s29u1u1, which should be wired connection. So, when you telnet 192.168.2.15 it uses the ethernet connection, which surely cannot connect. Can yu disable the ethernet connection, and restart the phone? You should get a network device with USB in its name and you should be able to connect.