Pixel saying it's connected but is not working (Orbi RBR20)

Back in late February my Google Pixel 1 phone stopped connecting to WiFi in the home. It appeared to not work at other wifi locations as well. I ordered a new Google Pixel 3. That new phone didn't connect to our WiFi. I returned it for another one and it's not connecting stil.
My husband's iPhone connects, our laptops connect and all other devices.
My new phone connects to WiFi everywhere but at home.

I try to use Instagram or Pinterest, for example, and it just spins and spins.

I have tried:
- rebooting my phone

- taking off battery saver

- rebooting orbi

- having the Internet tech from my provider in (nothing is wrong with our router)
- I was even able to connect to wifi in Cuba(!!!!) which is weak to begin with.

What can I do? My cell bill came in for $200 in overages. blah!