Describe the problem/error/question Hello, I have a local instance of n8n running on the latest stable release. I am experiencing issues while configuring OAuth connections for the tools (both Gmail and Outlook). I receive the error shown in the attached image. n8n is correctly published and acces…

hello nico, make sure your adding exact redirect url from n8n u were using, and also always enable the tool u wanna create,also for my opinion make sure you adding separate clien id if you wanna using different tool, so wht i mean by that each tool has different cliend id and secret may this help

Hey @Nico_Gualtieri , that 403 error when generating the auth URL usually means the OAuth app itself isn’t set up right on the Google/Microsoft side rather than an n8n config issue. For Google specifically you need to make sure you’ve enabled the Gmail API in your Cloud Console project (APIs & Servic…

Error using Oauth Authentication

Questions

Anshul_Namdev February 19, 2026, 9:55am 2

Hi @Nico_Gualtieri Welcome to the community!
Have you properly configured the redirect URL in the gmail on google cloud console? And what service are you using to make your local n8n instance live to the internet?

Error 403: Google OAuth Access Denied - Request Test User Access

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Error using Oauth Authentication

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