OK, here is the scenario: Two homes. Identical eero Wifi networks. Model X will connect to Wifi at both homes and download software updates, etc. Two different Model Y cars will connect at Home 1 no problem, but not Home 2 (error message: "Could not join <WIFINAME> The Internet is unreachable. Please check your firewall settings and Internet connection.") Here is what we have tried (many many times): Restarting the Model Ys Restarting the eero network Checking every single setting on both eero networks to make sure Home 1 and Home 2 have identical configurations. Even tried changing the network SSIDs to be identical Been trying everything we can think of for months at this point. Open to ideas.
How is the WiFi signal strength at Home #2? The WiFi antenna in the Model Y is located inside the passenger side mirror housing. Try parking closer to the house or backing into the parking space so the Model Y's WiFi antenna is closer to the router base unit. Can the router be moved even if this is just a few feet closer to the vehicle's location? You may need to try a WiFi extender to increase the coverage area.
At Home 2, the nearest eero beacon is in the garage and about 10 feet away from the car. If I sit in the car with my phone or laptop, I get maximum WiFi signal strength. This is actually closer than the setup at Home 1.
Maybe the Model Y is seeing multiple WiFi networks from several different eero beacons. What if you were to unplug one of the eero beacons, even the one in the garage, would there be enough signal for the phone from the next closest eero beacon?
Another possibility is interference from LED light bulbs, LED yard lighting power transformers. Also cordless phones (could be a neighbor's cordless phone): Do LED Lights Interfere With WiFi And Other Appliances? - LED & Lighting Info