I don’t even own a Grand Design, but I had to post my solution for others experiencing issues with their Furrion 7200. (Hey, my parents own a GD Momentum, let me stay!!)
I own a 2021 Keystone Hideout with a Furrion 7200 and found this thread while troubleshooting my own connection issues. I’ve seen two stupidly simple reasons why it won’t connect to, say, a brand-new smart TV that it has been connected to just fine for over a year, or my iPhone 15… both of the following issues have accounted for 100% of my connection issues so far.
Reason 1: you’ve got crap in the way. Make sure there is NOTHING between the TV and the Furrion 7200 main unit/panel. I make the mistake of leaving my big leather tote on the counter every other trip or so and spend a good 5 minutes cussing at everything before realizing it’s me; I'm the problem here; I’m dumb. Move the bag, try to reconnect, and boom! Connected.
Reason 2: you’ve got electronics plugged in between the TV and the unit/panel that interfere. I had an extension cord plugged in with USB outlets, one of which was in use. The moment I unplugged it, voilà! It worked.
I think it’s just got a pathetically weak BT sensor. While the RV itself is mid-grade, all the attached equipment is pretty garbo. Like, the Disney+ button on my LG smart TV remote changes the temperature of my electric heater.
Keep *everything* out of the area circled in the photo below:

Hope this helps!!