Google Sheet Connector doesn’t work

I have followed the instructions and can’t get Google Sheet Connector to sync.

1. At first, please install the addon and then Under ‘Addon settings’ section, enter the valid license key.
2. Then click “Get code” button under Addon settings to get access code from your gmail I’d. Save the settings.
3. Now, create a new quiz. Click Edit.
4. Under Google sheets settings of that quiz. Enter the Google sheets name and Google sheets tab name.
5. Save the settings. Now, whenever the quiz is submitted, results will be saved to the Corresponding Google Sheets.