GPS TRACKER, ST 901 SinoTrack unlocking???

Hi everyone, 

I need some help, if anybody knows what to do that would be great. I am not an expert on those things, I just "google" a lot to get familiar with everything. So I bought a GPS Tracker ST 901 that is registered to SinoTrack. Problem is that I am having 4 of them and I want them on the same user account and the only way to do it is to contact support, and they aren't replying to email. And the app is terrible. I was trying to (with help of ChatGPT) transfer to another server, like Traccar. Chat told me that I need to unlock the device through SMS which I did. I got an IP address and sent them to the device, devices accepted but when I went to Traccar app they were not online. 

Does anybody know what to do? I am dealing with these for last couple of days and I am getting tired