Third party security cameras won't connect from previously being connected.

My third party security cameras were previously connected. I lost connection on a couple of them at different times, but each time they failed to connect again. My camera reports a false error of incorrect wifi password. And apparently it's a known thing via their customer support Q&A's. I tried to do what it recommended but it recommended changing settings within my xfinity router and I don't see any similar settings it mentions at all. They need to be on 2.4ghz and I am running dual band. Buy recently I changed my dual signals wifi names to one name like x finity recommends but now I only see one network rather than the two 2.5.ghz And 5. With separate names. I still have one connected camera. Oh and I should mention the one camera was connected fine but I needed to move it to another location of the first camera that failed to reconnect. So I ended up with two disconnected cameras out of three. Basically they are not re pairing and not connecting to my wifi. I've reset my cameras several times. I even tried ethernet connecting since they are capable and that didn't work either. Even though I use wifi mostly I would also like ethernet to be an option at some point. Mainly just because they should be able to.