UEM reporting number of remotes is zero

[thr3shold]

I've been having functional issues for a number of years but just decided to give it a go in fixing it in recent weeks. There is an intermittent connection issue with the can bus high and low speed networks, but right now the UEM is connected. The remotes stopped working in 2015, but I still have them and with fresh batteries and a UEM reset (using the disconnect negative terminal then reconnect with key in position II and the lock/unlock 3 times method) they don't work. Pulling data from the UEM it shows zero as the number of remotes. I can get hardware and software numbers/identifiers from the UEM module so everything should be OK, but I'm clearly missing something. Does anyone have any suggestions?
Thanks in advance!