Yep so what you have is a newer remote on an older AGS module. The newer remote feature of RV/Other works because it is all programmed in the remote itself. It says "no comm" from the AGS module because the older AGS module cannot talk back to the remote it is all one way communication. Look at the module itself I bet you have knobs and it is starting from the setting the knobs are indicating. Newer remote and newer AGS have two way communication.
BTW the RV/Other was a change a few years back by RVIA who writes the standards for the RV OEMs (you have a sticker on the side of the coach with the RVIA emblem). The reason was they didn't want a tech to stop the generator outside for service and then have the gen start from the AGS setting. So now if the AGS starts AND stops the gen everything is still ENABLED and in AGS mode. If the generator is STOPPED manually from any station then the AGS MUST default to OFF for safety. The most common call is that the AGS started as it should but then someone manually stopped from the dash switch and now the AGS says OFF, yep just like intended. Setting to OTHER in the menu allows this feature to be bypassed and the AGS will always be ENABLED no matter how the generator was STOPPED.
Gary