Like you, uninstalling the app while I was in the “connecting” process and reinstalling it and then I had the vacuum listed finally.
My setup - Samsung Note 10+, separate 2.4Ghz network name on Frontier router, mobile data off. Tried Wyze app uninstall and reinstall, phone reboot, vacuum reset, but none of that worked. Also tried over 30 times varying things slightly and turning settings on, off, etc., but it would sit on the “connecting” screen for several minutes until it would fail. When pulling up the Wifi info, I was still connected to the Wyze vacuum. Seeing your post, I decided to get to the connecting screen and then just exit out of the app and uninstall it. Reinstalled and the vacuum was finally listed as a device. I then downloaded a firmware update and the vacuum is cleaning the house now.
I already have several Wyze Pan Cams, their scale, outdoor cam, and multiple lights. I never had any issues connecting like this. Wyze needs to investigate the issue immediately or they are going to see a lot of returns.
As for the vacuum, now that it’s connected, so far I really like it. It is on the standard suction mode and is running quieter than the Roomba it is replacing. It is also very organized with how it’s moving through the house instead of the random crap the Roomba did. It’s also not running into all the furniture. I saw others saying they were having a hard time getting the Wyze to get the first map of the house because it would get stuck and then they would move it which reset it. So far, none of that has happened, but it’s not done so we’ll see.
I know others are looking for solutions to connect to the vacuum. Try what I did because it worked for me.