In the Google home app, in the very top, there should be some colorful circles that say things like "routines," "media," etc depending on what you have on your network. There should be a circle that says "wifi." Click on that circle and it will bring you to a page similar to the old Google wifi app where you'll find your devices, speed tests, and other controls from the old Google wifi app.
Same here. I'm guessing your Google Home and Google Wifi apps were registered to separate email addresses. That's what happened to mine, and I'll be damned if I can find a way to get them under one roof, because inviting one to the other always ends with "Can't send invite right now Try Again"! Really hating me some Google.
I just wanted to jump in real fast to see if you saw Windflower's reply and to see if you still needed some help on this or if you were able to get it sorted out. If you are still needing some help, just let us know and we'll be happy to continue helping.
Just one quick final check in here since activity has slowed down. We'll be locking the thread in the next 24 hours, but if you still need help, I would be happy to keep it open. If there's more we can do, just let me know.