Hi there,
Please check what firmware version is installed in the devices, and install the newest one.
Check if you can see any message near the “Status” icon in Devices tab in RMS, next to the device in question.
If the device has an exclamation mark with an error message, and it states that service is disabled, please enable the service under Administration → Companies → View company details and if credits are available, please toggle the service on.
Please also advise if you have any remaining credits in RMS → Companies → View company details.
I also want you to go to WEBUI Services → Cloud solutions, and advise me what error you get there, when you add the device in RMS, and it tries to connect?
Also, please check this guide, which covers majority of basic RMS connection issues : https://wiki.teltonika-networks.com/view/Why_is_my_device_offline\_/\_not_activated_on_RMS%3F
Regards,
Arturas