it’s a Liftmaster garage door opener with Wifi & MyQ. Looks like “elite” model with battery backup
Edit: All set!! I don’t know why… but the 100th time was the charm.
For the record I have Eero had had 2g & 5g ON (forgot to go into “legacy mode”) but did have WPA3 OFF. I used setup via my laptop rather than phone app.
Anyway - thanks
These instructions did it for me: