I just found this Google settings page by accident: https://myaccount.google.com/connections/settings https://myaccount.google.com/connections/settings It has

I just found this Google settings page by accident: https://myaccount.google.com/connections/settings https://myaccount.google.com/connections/settings It has just one switch: "Allow Google to display a sign-in prompt where it’s supported by third-party apps and services" Could that be it?