Does an UNmigrated Works With Nest Account Still Work?

Hello. In 2018, I played around with Home Assistant and I was able to successfully integrate my Nest Cameras and Smoke/CO monitor. I still have my Client ID and Client secret.

When I tried to integrate my Nest devices now, I am being asked for a PIN code. But when I go to the Works With Nest website and login in and click ALLOW, I get an error message that says “Oops! We’ve encountered an error. Please try again.”. I keep getting this message no matter what browser or computer I use.

I know if I migrate my Nest account to Google, then Works with Nest will not work anymore. But I haven’t migrated it yet.

Is the Nest integration still working? Should I migrate it to Works with Google Assistant? Is Home Assistant able to access Nest Devices with Works With Google Assistant?