Here are step-by-step instructions on how to enable third-party cookies in your Google Chrome browser.
Step 1: Open Google Chrome browser, click the settings menu in the top right (3 vertical dots).
Step 2: Click the Search Settings bar at the top and type cookies in the search box.
Step 3: Click the Site Setting section to access the cookies settings.
Step 4: Click Cookies under Site Settings section.
Step 5: Disable the “Block third-party cookies” setting under Cookies section.
Reload the Google Form / Google Sheet and the addon will now load with cookies enabled.