Figured it out for Google home
I got four of these from my father in law. We both like tech, and I guess he couldn’t figure them out. I had the same problem he did, but have more patience, they would fail when trying to connect to my WiFi. I noticed they use 2.4Ghz. I have a tri-band router that should auto connect to the right frequency. I guess this was not the case. I let them sit for about 4 months and decided to try again.
I took one device and setup a 2.4Ghz guest network on my router and connected my phone to it. I ran the app setup and the plug was discovered and connected in about thirty seconds. I tested the on/off switch and it worked.
I then reconnected my phone to my primary network, opened Google home, added a device that works with Google, searched eques elf, et voila!
I’m rating 3 because it works, however, I had to provide my own IT support.