First please try to identify your tracker on id.wialon.net as one of the devices Xexun, Coban, Concox.
If your tracker is determined, take a screenshot, write down the name of the model of the tracker and the identified ID (may coincide with the IMEI, may be part of it with zero or without).
After that, return to the application in the unit settings (unit menu - Settings - Common Settings), specify the determined model and ID. After that, configure the tracker on the defined server and port.
Also when configuring your tracker you can try to indicate IP or DNS server format, to see it, click the IP button next to the server value in the unit settings (Unit menu - Settings - Common settings). You can read more information here https://forum.gps-trace.com/d/586-ip-and-dns-server-formats-in-the-application