Why am I getting an Unauthorized page when installing the app?

Why am I getting an Unauthorized page when installing the app?

This is commonly because the API access is disabled in your G Suite domain, you'll need to enable it as Zumpul uses it to read your users and their profiles, for more information on how to enable it, you can watch this tutorial: https://support.zumpul.com/portal/en/kb/articles/101-prepare-your-domain-for-the-installation