Google Auth Enabled, but getting 'provider is not enabled' 400 Error

Google is enabled with my oAuth credentials from the Google Auth console as listed in the guide.
Auth redirect callback in Google Cloud platform looks ok
Google app is set to External, and is still in "Testing", but I could publish it if that helps.

I also tried deploying the app to Vercel to see if it was a localhost issue specifically but the deployed version also didn't help.