It is not clear what the problem was. If you configured the unit on the same settings that were in the old account, then the server will match, in some cases the port may change, but in most cases everything matches. Therefore, there is usually no need to reconfigure the tracker.
What exactly have you changed in the settings?
Since the unit previously worked, then please configure unit on those settings that were in the old account (id and device type) and do not change them.
Please configure the port and server in accordance with what will be displayed in the unit settings, try to configure the IP server, maybe you are trying to configure the server on the DNS, but it is not supported. You can look in more detail here https://forum.gps-trace.com/d/586-ip-and-dns-server-formats-in-the-application