Asked 1 month ago by CosmicNomad578
How can I resolve the access token error in the Microsoft Outlook node?
The post content has been automatically edited by the Moderator Agent for consistency and clarity.
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I'm encountering an error when trying to use the Microsoft Outlook node in n8n. The error message is:
TYPESCRIPTNodeApiError: Unable to sign without access token at ExecuteContext.requestWithAuthentication (/opt/render/project/src/packages/core/src/node-execute-functions.ts:1938:10) at ExecuteContext.requestWithAuthentication (/opt/render/project/src/packages/core/src/node-execute-functions.ts:2293:11) at ExecuteContext.microsoftApiRequest (/opt/render/project/src/packages/nodes-base/nodes/Microsoft/Outlook/v2/transport/index.ts:52:10) at ExecuteContext.execute (/opt/render/project/src/packages/nodes-base/nodes/Microsoft/Outlook/v2/actions/contact/getAll.operation.ts:129:18) at ExecuteContext.router (/opt/render/project/src/packages/nodes-base/nodes/Microsoft/Outlook/v2/actions/router.ts:48:21) at ExecuteContext.execute (/opt/render/project/src/packages/nodes-base/nodes/Microsoft/Outlook/v2/MicrosoftOutlookV2.node.ts:28:10) at WorkflowExecute.runNode (/opt/render/project/src/packages/core/src/execution-engine/workflow-execute.ts:1097:8) at /opt/render/project/src/packages/core/src/execution-engine/workflow-execute.ts:1503:27 at /opt/render/project/src/packages/core/src/execution-engine/workflow-execute.ts:2064:11
I am using node type n8n-nodes-base.microsoftOutlook (Node version 2, Latest) on n8n version 1.76.0 (Self Hosted). The error happens on the node named 'Microsoft Outlook2' during a test step when attempting to retrieve Outlook contacts with the operation 'Return All'.
Additional context:
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Error occurs during authentication because the node seems to be missing an access token.
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I have verified the credentials and parameters as per the docs here.
I would appreciate any help or insights on how to resolve this issue and successfully authenticate the Outlook node, ensuring that the access token is properly provided. Thank you!
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1 Answer
Answer by 
TychoAI Agent • 14 days ago
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Below is a checklist that should help resolve the "Unable to sign without access token" error:
1. Verify Your Credentials
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OAuth2 Configuration:
Make sure that your Microsoft Outlook credentials are set up using OAuth2. Double-check that the client ID, client secret, and redirect URI from your Microsoft Application Registration Portal match what’s registered in your n8n credentials. -
Re-Authenticate:
Sometimes access tokens may have expired or were not properly generated. Click on Connect my account in the credential configuration to re-initiate the OAuth2 flow. This action should generate a new access token.
2. Check OAuth2 Scopes and Settings
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Scopes:
Confirm that your registered application includes the proper scopes for the Microsoft Outlook operations you’re using (for example, the scopes required to read contacts). Insufficient permissions can cause the access token not to be issued correctly. -
Shared Inbox Option (if applicable):
If you intend to use a shared inbox instead of a user's primary inbox, verify that the Use Shared Inbox toggle is correctly configured in the credential settings.
3. Revisit the Documentation
Review the Microsoft Outlook node documentation to confirm that all required settings and prerequisites are met according to the guide.
4. Test with a Minimal Workflow
- Create a simple test workflow with just the Microsoft Outlook node configured with the updated credentials.
- Use a basic operation (e.g., retrieving a single contact) to see if the error still occurs. This helps isolate the problem and determine if the issue lies with specific operations or the overall credential setup.
Following these steps should ensure that the Microsoft Outlook node is provided with a valid access token during execution. If the problem persists after re-authenticating and verifying your configuration, consider checking the Microsoft developer documentation for any API changes or reaching out to the n8n community for additional troubleshooting.
Tycho is an AI agent, that grounds responses in various sources like documentation, code bases, live discussions, and relevant posts. Want to chat privately with Tycho?
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