Oauth Redirect URL Problem - Microsoft Outlook Oauth2 API

Questions
1

Describe the problem/error/question

I need to make a new Microsoft Outlook Oauth2 API Credential.

I have successfully type-in the client ID and the client secret. I notice that the OAuth Redirect URL pointing at “http://localhost:5678/…” (the default URL for n8n community edition).

JZko1mvPaU
JZko1mvPaU1070×419 45 KB

I also have configured the Azure App Registrations - Redirect URLs , using my endpoint domain name (Reverse Proxy). In the image below, I change my real domain name with “n8n.mydomainname.com”.

E0KcWYC5wp
E0KcWYC5wp1251×881 133 KB

What is the error message (if any)?

I got this error message when I tried to “Connect my account” in the Credential dialog.

dZ1UdF62Lz
dZ1UdF62Lz506×871 91.8 KB

I have tried to change the “localhost” using the .env file and/or using the config file, but not working.

Information on your n8n setup

  • **n8n version: 1.98.2
  • **Database (default: SQLite): SQLite
  • **n8n EXECUTIONS_PROCESS setting (default: own, main): own
  • **Running n8n via (Docker, npm, n8n cloud, desktop app): npm
  • **Operating system: Win Server 2019

What should I do to solve this problem ?
Thank you.

2

Hello @bagus88 ,

This error is telling you exactly what’s wrong! The redirect URI you’re using doesn’t match what’s configured in your Azure app registration.

The Problem:

  • Your request is using: http://localhost:5678/rest/oauth2-credential/callback
  • But this URL is not registered in your Azure app’s redirect URIs

How to Fix:

  1. Go to Azure Portal (portal.azure.com)

  2. Navigate to: Azure Active Directory → App registrations → [Your App]

  3. Click on: “Authentication” in the left sidebar

  4. Under “Redirect URIs”:

    • Click “Add a platform”
    • Select “Web”
    • Add this exact URL: http://localhost:5678/rest/oauth2-credential/callback
    • Click “Configure”

  5. Make sure to click “Save” at the top

3

Thanks @mrrobot for your quick response.

I also have tried to do as you suggested.

chrome_1ilk1ilNL0
chrome_1ilk1ilNL01230×689 120 KB

I got this error message

chrome_faDtMit8wu
chrome_faDtMit8wu506×782 28.3 KB

For your information, I am accessing the workflow editor (n8n community edition server), using the publish domain name (not using the VM’s).

Looking forward for your kindly response, thank you.

4

The reason it isn’t working is because it’s local host. You need use a reverse proxy so it can connect with an IP.

5

@bagus88 ,

Azure apps support localhost redirect uri.

My question is: since you have a domain why use localhost and not setup a tunnel like cloudflare tunnel or a reverse proxy and reference to that your n8n subdomain and not localhost ?

6

Hi @Grot

Thank you for your reply.

I have use the reverse proxy using Cloudflare tunnel. Therefore I could access the n8n community edition server through my domain name.

AsnnXrICZH
AsnnXrICZH1800×862 115 KB

The problem is :
I can’t change the OAuth Redirect URL (https://localhost:5678/…) with the "n8n.mydomainname.id (as shown in the address bar of the browser).

The Microsoft Outlook OAuth2 API always displays an error message, either
a. “localhost refused to connect” if I write the exact OAuth Redirect URL in the n8n MS Outlook Credential above in the Microsoft Azure - Platform Configuration - WEB Redirect URLs

b. “The redirect URL, specified in the request does not match the redirect URLs configured for the application.” if I write my n8n domain name in the n8n MS Outlook Credential above in the Microsoft Azure - Platform Configuration - WEB Redirect URLs.

I have tried to change the “localhost:5678” configuration, using the .env file and the config file, still not solving the problem.

7

Hi @mrrobot

I understand what you mean. I have also used Cloudflare tunnel as a Reverse Proxy.

In the following image, you can see that I have accessed the n8n subdomain using the domain name.

AsnnXrICZH
AsnnXrICZH1800×862 115 KB

8

Hey @bagus88 ,

You have to set your
WEBHOOK_URL env correctly to that subdomain