Hello, EmersonDronesVdeosAreos,
GT06 usually works on one of the protocols Xexun, Coban, Concox.
If you would like to connect your tracker using the Xexun protocol, you need to set 12 character ID: 0 + [11 last digits of IMEI].
If you would like to connect your tracker using the Coban or Concox protocol, you need to use 15 character IMEI.
Please, first of all, check the correctness of the entered ID / IMEI in the application in accordance with the specified in the tracker.
After unit creating you should configure the tracker to the new IP: PORT specified in the application via SMS command.
Such commands can have different format, it can be found in the tracker manual. Please, note that protocols (Xexun, Coban, Concox) have different ports.