New 2021 GMC Furrion Camera Issue

[Harlow]

We just traded our 1 Ton GMC and our 2018 Montana 42' for smaller truck and Montana (3121RL) but kept our Furrion camera as it was relatively new(a second purchase). We have not been able to get it to work with the new system set up as of yet. We verified it worked on the traded unit so know it works on the longer RV and we have gone to 7 feet less so that should not be a problem. We have talked to GMC and have received an adapter for the GMC side. We called Furrion and was advised to pair the camera and screen. We did that and it looked great in the truck but when we put the camera back on the RV it says no signal. That is with the running lights on. What is next? Has anyone else had this issue? Any and all help is appreciated!