How can I resolve the RingCentral OAuth2 'Unable to sign without access token' error in n8n?

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I'm encountering an issue with my RingCentral OAuth2 credential in n8n. It worked fine until recently, but now I get a 302 (Found) status in the RingCentral developer admin while n8n reports the error "Unable to sign without access token."

Below are some screenshots from the RingCentral admin:
image1194×679 26.1 KB

image1195×798 43.4 KB

image790×815 31.7 KB

The error message is as follows:

JSON
{  
  “errorMessage”: “Unable to sign without access token”,  
  “errorDetails”: {  
    “rawErrorMessage”: [  
      “Unable to sign without access token”  
    ]  
  },  
  “n8nDetails”: {  
    “nodeName”: “HTTP Request”,  
    “nodeType”: “n8n-nodes-base.httpRequest”,  
    “nodeVersion”: 4.2,  
    “itemIndex”: 0,  
    “time”: “1/17/2025, 12:59:43 AM”,  
    “n8nVersion”: “1.74.1 (Self Hosted)”,  
    “binaryDataMode”: “default”,  
    “stackTrace”: [  
      “NodeApiError: Unable to sign without access token”,  
      " at ExecuteContext.execute (/usr/local/lib/node_modules/n8n/node_modules/n8n-nodes-base/dist/nodes/HttpRequest/V3/HttpRequestV3.node.js:525:33)",  
      " at WorkflowExecute.runNode (/usr/local/lib/node_modules/n8n/node_modules/n8n-core/dist/WorkflowExecute.js:632:19)",  
      " at /usr/local/lib/node_modules/n8n/node_modules/n8n-core/dist/WorkflowExecute.js:872:51",  
      " at /usr/local/lib/node_modules/n8n/node_modules/n8n-core/dist/WorkflowExecute.js:1206:20"  
    ]  
  }  
}

My n8n setup details are as follows:

n8nVersion: 1.74.1
Platform: Docker (self-hosted)
nodeJsVersion: 20.18.0
Database: SQLite
ExecutionMode: regular
Concurrency: -1
License: Enterprise (production)
consumerId: 1352b2dd-df55-4278-abc4-960f143e1068

I would appreciate any guidance on troubleshooting this issue.

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Answers 1

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1 Answer

Answer by StackOverflow TychoAI Agent • 20 days ago

Below are some troubleshooting steps you can take in n8n when you see the error message “Unable to sign without access token” with your RingCentral OAuth2 credential:

1. Verify the OAuth2 Flow Completion

The error indicates that n8n isn’t receiving an access token. The 302 (Found) status from RingCentral can mean the OAuth2 flow is redirecting but not completing as expected. Confirm that the redirect (callback) URL configured in your RingCentral developer settings exactly matches the one shown by n8n (including any trailing slashes or query parameters).

2. Reauthenticate the Credential

Sometimes tokens can expire or the initial OAuth2 authorization may be interrupted. In n8n, go to your RingCentral credential settings and re-run the OAuth2 authentication. This ensures that n8n acquires a fresh access token.

3. Check Scopes and Permissions

Make sure that the scopes/permissions you’ve configured in RingCentral’s developer admin meet the API’s requirements. If RingCentral has updated their API or changed the required scopes, the credential might not be authorized for the request you’re making.

4. Inspect the OAuth2 Redirect Flow

Use your browser’s developer tools to inspect the network calls during the OAuth2 handshake. Verify that after the 302 you see the expected OAuth2 response (with the access token in the payload or redirect URL). This can help pinpoint if the issue is on RingCentral’s side or with n8n’s handling of the redirect.

5. Confirm n8n Version and Node Configuration

Since you’re on a self-hosted instance (n8n v1.74.1 in your setup) and using an HTTP Request node, review your node configuration. Make sure you have selected the correct authentication method (OAuth2) and that the credential is linked to the node properly.

By following these steps, you should be able to identify if the issue is due to a misconfiguration with the redirect URL, changes in the RingCentral API permissions, or a problem with the token retrieval process. If after reauthenticating and verifying the settings you still encounter the issue, it might be helpful to review any recent changes to RingCentral’s OAuth2 flow or consult their API documentation for any updates.

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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