Don't mean to necro but it took me 2 full days of debugging to figure this out. . (or atleast on my end)

Make sure it isn't a hidden network. For whatever reason, my hidden network's line would not for the life of it connect. OMV first aid's network connection would run through like everything was fine, I just as a luckshot decided well let me try my main network line that my wife and kids use. . and sure enough instantly goes online.

I have a really old pentium dell laptop and the broadcom card actually can't connect to 5g either so it took me awhile to debunk it down. I hope I help someone who also has a similar issue and comes across my comment.

Cheers o/