How to Generate Google Authorization Code
step-1
Ignore this step if your configuring and generating Google Authorization Code first time.
Go to Jira Settings > Apps > Manage Google Groups Sync
Click Configure Google
Click Revoke
step-2
Click Authorize button to generate Google Authorization Code
Choose / Confirm Google Login:
Click Allow read access to Google Groups:
Copy below one time Google Authorization Code:
step-3
Copy above Google Authorization Code
Click Update.
step-4
Click Test Connection twice to make sure authorization is valid.