The newly added device does not indicate any attempts to connect to RMS.
Do you have any chance to access device's WebUI, navigate to Services -> Cloud solutions -> RMS and tell, what is given next to their Connection state line, and also press Connect button?
Alternatively, if device uses mobile connectivity, could you send the following couple of SMS messages:
- <password> rms_status
- <password> rms_connect
Replace <password> with the password you use to login to router's WebUI.
Best regards,