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 have been through the article above and still have the issue, I keep seeing error 20 which shows the device is trying to connect but does not go any further.
I have 12 remaining credits and I have local access to the device.
I have sent you a form for private communication, please fill in the form, and in ticket ID provide this query ID which is 14776. This form should arrive to your personal email address used to register to this site.
Update on this, turned out the mobile provider was set to ipv4/ipv6 so I was getting an ipv6 address, once I swapped this to ipv4 it all started working and connected straight to RMS.