403 error - Google Workspace SSO (self hosted)

Questions
1

Hi, I am trying to setup SSO via Google Workspace.

This is an on-prem deployment with Business license.

In Google Workspace I created a new SAML app and set the ACS and Entity ID copied from the n8n page. I then enabled access for everyone and downloaded the metadata XML file.

When I paste that XML file in the n8n SSO page it says “Error saving SAML SSO configuration

Request failed with status code 403”

There are no other logs I can find. Any idea what is going wrong?

2

Google Workspace SSO returning a 403 error is typically caused by incorrect OAuth client ID/secret configuration or unauthorized domains. You must verify in the Google Cloud Console that the authorized JavaScript origins and authorized redirect URIs include the n8n instance address.

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