Why did my admin authorization fail while connecting Google Admin Console?

Admin authorization can fail due to one of the below mentioned reasons.

1. Invalid credentials - The client ID and secret credentials are not associated with the account being authorized. Please check if you are authorizing the correct account and try again.

2. Redirect URI mismatch - The redirect URI is incorrect. Please create the credentials with the correct URI.

3. Authorization window closed before completing the process - Retry the authorization.

4. Popup blocked by the browser (can retry) - Allow pop-ups and retry authorization.