Did you try to complete the HMS setup when using ethernet? You need to setup HMS and get the hub connected to your account BEFORE trying to setup the wifi. There is an option for the hub to switch network connections but only after it is setup.
There may be other problems at play here since I’ve seen several similar posts about not being able to setup the hub or attach sensors to the hub. An ethernet connection should at least get HMS up and running. Another option is to temporarily disable an 5ghz network on your routers while you setup the hub. You should also consider what special characters you may have in your SSID or password, as well as the password length. Both can cause problems.
Here is one such post: