I am unable to install the Google Forms add-on

You can install the Google Forms add-on from the Google Marketplace with your Gmail or Google Workspace account.

Running in Loops

If you press the "Install" button, it shows a loading circle on a white window, but doesn't move on to 'accepted' window.

You can resolve this issue by signing out of multiple Google accounts.

Install Button Disabled

If you are unable to add the add-on to your Google Forms because the install button is disabled and grayed out, you need to contact your Google Workspace admin to whitelist the app.

Please see this page detailing how your admin can add the Google Forms add-on to your domain's allowlist.