GSuite Security Settings for Webhooks
If you are using a Google account that is part of a GSuite domain and you are setting up webhooks in Google sheets, as described in this blog, you will need to enable link access to Google docs.
In your Google Admin console (at admin.google.com) make sure you are logged in as a domain admin.
Go to Apps G Suite Drive and Docs.
- Click Sharing settings.
Now enable the highlighted options for your company, the screenshot shows the settings for 'supertec' :
P.S: These instructions were taken from this knowledgebase article written by Google: https://support.google.com/a/answer/60781?hl=en