Our users that upgraded from 2020.2.3 to 2021.x appear to have an issue now with connecting to BigQuery using the End user Oauth connection.
They can enter the client ID & Secret, and the pop-up window to authenticate with Google comes up. They complete that, and the screen says to switch back to the application, but Alteryx Designer does not change to reflect that they are authenticated.
Those still working in 2020 designer, and workflows created in 2020 still work. But since the upgrade the Oauth token does not seem to refresh the Designer interface.