Power BI node OAuth authentication fails with “Unable to proceed without access token

Questions
1

Describe the problem/error/question

I’m facing an issue with the Power BI node in n8n while trying to connect my Microsoft Power BI account.
The authentication flow does not complete successfully, and the node fails due to a missing access token.

What is the error message (if any)?

Problem in node:
PartialExecutionToolExecutor

Error:

Error executing tool: Unable to proceed without access token

Screenshot for reference:
https://prnt.sc/Jj_rrQVNPNsq

During the OAuth callback, n8n also receives the following error from Microsoft:

{
  "error": "access_denied",
  "error_subcode": "cancel",
  "error_description": "AADSTS65004: User declined to consent to access the app."
}

Please share your workflow

(Select the nodes on your canvas and use the keyboard shortcuts CMD+C/CTRL+C and CMD+V/CTRL+V to copy and paste the workflow.)

Share the output returned by the last node

The issue occurs during credential authentication, before any workflow execution.
No workflow nodes are executed beyond attempting to connect the Power BI credentials.
Not applicable, the error occurs during the Power BI credential connection step, before node execution.

Information on your n8n setup

  • n8n version: 2.6.3
  • **Database (default: SQLite):**Default
  • **n8n EXECUTIONS_PROCESS setting (default: own, main):**Default
  • **Running n8n via (Docker, npm, n8n cloud, desktop app):**n8n Cloud
  • Operating system:
3

Hi @Gyan Welcome!
You must redo the Power BI OAuth credential and completely fill out the Microsoft consent screen (accepting all permissions and disabling popup blockers) so that n8n will receive an access token and not access_denied.

4

Hi @Gyan

Welcome to the n8n community :tada:

Based on the Microsoft logs showing access_denied with User declined to consent, the issue is clear: the consent wasn’t completed. Without it, Microsoft won’t issue an access token and n8n can’t proceed.

Here's what you need to do

When you click Connect my account in n8n Cloud, a Microsoft consent screen will appear. You must click Accept on that screen. If you see “Need admin approval” or similar, your tenant requires admin consent. In that case, contact your Microsoft 365 or Azure admin to either grant admin consent for the app or enable user consent in tenant settings.
If you’re using your own Azure app registration for Power BI instead of n8n’s managed credentials, verify the Redirect URI is set to https://YOUR-PROJECT.app.n8n.cloud/rest/oauth2-credential/callback

the credential will only work once consent is accepted on the Microsoft side. Retry the connection and make sure to complete the consent flow without canceling or closing the window.