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.
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In your Google Admin console (at admin.google.com) make sure you are logged in as a domain admin.
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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