Hi Jerome, thanks for taking the time to answer.
The device has been on RMS for approx a year, I obtained a second device which runs offshore, so I decided to buy credits for the RMS service to monitor both the devices on 22/10/2019. So the router was connected (with valid credits) between 22/10 and 02/11 and the graphs and update history were being populated between those dates.
I've just logged into RMS and have found that there is now a single monitoring update that has happened on 9th Nov @ 21:45, if I try to "force update" nothing happens, there's no change and no new record added to Device Update History.
Dynamic Monitoring is set to 5 mins and Static to 15 days, probably don't need to send a screenshot? Basically the monitoring details page is showing the last successful update on 9th Nov @ 21;45, this of course should be updated every 5 mins.