I've figured it out myself for my issue (after chatting with service
representative for over 2 hours) – I updated the Google Home app to the
latest version on my iOS mobile app store. That's all there was to
fixing it.
I'm having the same issue right now. We changed our WIFI network to
something else. When I try to connect it with the Google Home app, it
says "connecting to joining device" and "Something went wrong. Try
connecting again. If that doesn't work, try r...