Google OAuth2

I am new to Rad Studio - and this forum, so I apologize in advance if this is an inappropriate forum for this question.

I have just downloaded and started looking through the examples and am very interested in OAuth2.

I am looking at the REST.RESTDemo Sample ( \Users\Public\Documents\Embarcadero\Studio\20.0\Samples\Object Pascal\Database\RESTDemo\ ), and have followed the instructions in the readme.html

I have created a project in the Google Cloud Platform and the associated credentials in the APIs & Services

I have entered these credentials (Client ID & Client Secret) in the fields on the "Google (Tasks) tab"

When I click the "Step #1 fetch auth-code & access-token

I get the browser window for authentication

enter the google email and password

the "Allow" button is disabled