Hello, Please can you check the following on the device:
1> Does the device have a stable internet connection ?
2> What DNS server's are the device using ?
3> If you have local access to the device then from the CLI of the device try to ping rms.teltonika.lt and check if it resolves fine ?
4> In the device GUI go to System -> Administration -> RMS WebUI page and insert the ip address of RMS service instead of domain name "18.196.62.30" and check if that works.
Thanks