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n8n - ๐Ÿ’ก(How to fix) Fix Generic OAuth2 is not refreshing

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Error Message

Output 1 item Authorization failed - please check your credentials Unsupported content type: text/plain; charset=utf-8 Error details

From HTTP Request Error code

401

Full message

Unsupported content type: text/plain; charset=utf-8 Request

{ "hidden": "{\n "query": "{ quotes(first: 10, filter: { status: converted}) { nodes { id quoteNumber notes(first: 5) { nodes { ... on QuoteNote { message } } } } } }"\n}", "headers": { "content-type": "application/json", "x-jobber-graphql-version": "2025-04-16", "accept": "application/json,text/html,application/xhtml+xml,application/xml,text/;q=0.9, image/;q=0.8, /;q=0.7", "Authorization": "hidden" }, "method": "POST", "uri": "https://api.getjobber.com/api/graphql", "gzip": true, "rejectUnauthorized": true, "followRedirect": true, "resolveWithFullResponse": true, "sendCredentialsOnCrossOriginRedirect": false, "followAllRedirects": true, "timeout": 300000, "encoding": null, "json": false, "useStream": true } Other info Item Index

0

Node type

n8n-nodes-base.httpRequest

Node version

4.4 (Latest)

n8n version

2.20.6 (Self Hosted)

Time

5/12/2026, 9:52:03 AM

Stack trace

NodeApiError: Authorization failed - please check your credentials at ExecuteContext.execute (/usr/local/lib/node_modules/n8n/node_modules/.pnpm/n8n-nodes-base@file+packages+nodes-base_@[email protected]_asn1.js@5_8da18263ca0574b0db58d4fefd8173ce/node_modules/n8n-nodes-base/nodes/HttpRequest/V3/HttpRequestV3.node.ts:825:16) at WorkflowExecute.executeNode (/usr/local/lib/node_modules/n8n/node_modules/.pnpm/n8n-core@file+packages+core_@[email protected]_@opentelemetry+exporter-trace-otlp_2c2e1f47b69b34bef6f634a13cbf61d9/node_modules/n8n-core/src/execution-engine/workflow-execute.ts:1048:9) at WorkflowExecute.runNode (/usr/local/lib/node_modules/n8n/node_modules/.pnpm/n8n-core@file+packages+core_@[email protected]_@opentelemetry+exporter-trace-otlp_2c2e1f47b69b34bef6f634a13cbf61d9/node_modules/n8n-core/src/execution-engine/workflow-execute.ts:1239:11) at /usr/local/lib/node_modules/n8n/node_modules/.pnpm/n8n-core@file+packages+core_@[email protected]_@opentelemetry+exporter-trace-otlp_2c2e1f47b69b34bef6f634a13cbf61d9/node_modules/n8n-core/src/execution-engine/workflow-execute.ts:1687:27 at /usr/local/lib/node_modules/n8n/node_modules/.pnpm/n8n-core@file+packages+core_@[email protected]_@opentelemetry+exporter-trace-otlp_2c2e1f47b69b34bef6f634a13cbf61d9/node_modules/n8n-core/src/execution-engine/workflow-execute.ts:2339:11

Code Example

Output
1 item
Authorization failed - please check your credentials
Unsupported content type: text/plain; charset=utf-8
Error details

 From HTTP Request
Error code

401

Full message

Unsupported content type: text/plain; charset=utf-8
Request

{ "**hidden**": "{\n \"query\": \"{ quotes(first: 10, filter: { status: converted}) { nodes { id quoteNumber notes(first: 5) { nodes { ... on QuoteNote { message } } } } } }\"\n}", "headers": { "content-type": "application/json", "x-jobber-graphql-version": "2025-04-16", "accept": "application/json,text/html,application/xhtml+xml,application/xml,text/*;q=0.9, image/*;q=0.8, */*;q=0.7", "Authorization": "**hidden**" }, "method": "POST", "uri": "https://api.getjobber.com/api/graphql", "gzip": true, "rejectUnauthorized": true, "followRedirect": true, "resolveWithFullResponse": true, "sendCredentialsOnCrossOriginRedirect": false, "followAllRedirects": true, "timeout": 300000, "encoding": null, "json": false, "useStream": true }
 Other info
Item Index

0

Node type

n8n-nodes-base.httpRequest

Node version

4.4 (Latest)

n8n version

2.20.6 (Self Hosted)

Time

5/12/2026, 9:52:03 AM

Stack trace

NodeApiError: Authorization failed - please check your credentials at ExecuteContext.execute (/usr/local/lib/node_modules/n8n/node_modules/.pnpm/n8n-nodes-base@file+packages+nodes-base_@aws-sdk+credential-providers@3.808.0_asn1.js@5_8da18263ca0574b0db58d4fefd8173ce/node_modules/n8n-nodes-base/nodes/HttpRequest/V3/HttpRequestV3.node.ts:825:16) at WorkflowExecute.executeNode (/usr/local/lib/node_modules/n8n/node_modules/.pnpm/n8n-core@file+packages+core_@opentelemetry+api@1.9.0_@opentelemetry+exporter-trace-otlp_2c2e1f47b69b34bef6f634a13cbf61d9/node_modules/n8n-core/src/execution-engine/workflow-execute.ts:1048:9) at WorkflowExecute.runNode (/usr/local/lib/node_modules/n8n/node_modules/.pnpm/n8n-core@file+packages+core_@opentelemetry+api@1.9.0_@opentelemetry+exporter-trace-otlp_2c2e1f47b69b34bef6f634a13cbf61d9/node_modules/n8n-core/src/execution-engine/workflow-execute.ts:1239:11) at /usr/local/lib/node_modules/n8n/node_modules/.pnpm/n8n-core@file+packages+core_@opentelemetry+api@1.9.0_@opentelemetry+exporter-trace-otlp_2c2e1f47b69b34bef6f634a13cbf61d9/node_modules/n8n-core/src/execution-engine/workflow-execute.ts:1687:27 at /usr/local/lib/node_modules/n8n/node_modules/.pnpm/n8n-core@file+packages+core_@opentelemetry+api@1.9.0_@opentelemetry+exporter-trace-otlp_2c2e1f47b69b34bef6f634a13cbf61d9/node_modules/n8n-core/src/execution-engine/workflow-execute.ts:2339:11
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Bug Description

I'm attempting to create workflows with Jobber's API and running into issues with expiring credentials. Seems similar to https://github.com/n8n-io/n8n/issues/25926, although I havn't seen invalid_grant,

Here's their documentation - https://developer.getjobber.com/docs/building_your_app/app_authorization/

I'm able to authorize initially, however after the 1 hour expiration I get the following error

Output
1 item
Authorization failed - please check your credentials
Unsupported content type: text/plain; charset=utf-8
Error details

 From HTTP Request
Error code

401

Full message

Unsupported content type: text/plain; charset=utf-8
Request

{ "**hidden**": "{\n \"query\": \"{ quotes(first: 10, filter: { status: converted}) { nodes { id quoteNumber notes(first: 5) { nodes { ... on QuoteNote { message } } } } } }\"\n}", "headers": { "content-type": "application/json", "x-jobber-graphql-version": "2025-04-16", "accept": "application/json,text/html,application/xhtml+xml,application/xml,text/*;q=0.9, image/*;q=0.8, */*;q=0.7", "Authorization": "**hidden**" }, "method": "POST", "uri": "https://api.getjobber.com/api/graphql", "gzip": true, "rejectUnauthorized": true, "followRedirect": true, "resolveWithFullResponse": true, "sendCredentialsOnCrossOriginRedirect": false, "followAllRedirects": true, "timeout": 300000, "encoding": null, "json": false, "useStream": true }
 Other info
Item Index

0

Node type

n8n-nodes-base.httpRequest

Node version

4.4 (Latest)

n8n version

2.20.6 (Self Hosted)

Time

5/12/2026, 9:52:03 AM

Stack trace

NodeApiError: Authorization failed - please check your credentials at ExecuteContext.execute (/usr/local/lib/node_modules/n8n/node_modules/.pnpm/n8n-nodes-base@file+packages+nodes-base_@[email protected]_asn1.js@5_8da18263ca0574b0db58d4fefd8173ce/node_modules/n8n-nodes-base/nodes/HttpRequest/V3/HttpRequestV3.node.ts:825:16) at WorkflowExecute.executeNode (/usr/local/lib/node_modules/n8n/node_modules/.pnpm/n8n-core@file+packages+core_@[email protected]_@opentelemetry+exporter-trace-otlp_2c2e1f47b69b34bef6f634a13cbf61d9/node_modules/n8n-core/src/execution-engine/workflow-execute.ts:1048:9) at WorkflowExecute.runNode (/usr/local/lib/node_modules/n8n/node_modules/.pnpm/n8n-core@file+packages+core_@[email protected]_@opentelemetry+exporter-trace-otlp_2c2e1f47b69b34bef6f634a13cbf61d9/node_modules/n8n-core/src/execution-engine/workflow-execute.ts:1239:11) at /usr/local/lib/node_modules/n8n/node_modules/.pnpm/n8n-core@file+packages+core_@[email protected]_@opentelemetry+exporter-trace-otlp_2c2e1f47b69b34bef6f634a13cbf61d9/node_modules/n8n-core/src/execution-engine/workflow-execute.ts:1687:27 at /usr/local/lib/node_modules/n8n/node_modules/.pnpm/n8n-core@file+packages+core_@[email protected]_@opentelemetry+exporter-trace-otlp_2c2e1f47b69b34bef6f634a13cbf61d9/node_modules/n8n-core/src/execution-engine/workflow-execute.ts:2339:11

My understanding is that the 401 response should trigger a token refresh, but that doesn't seem to be happening. Retriggering the workflow doesn't help either.

If I go into credentials I can hit "reconnect" which will allow subsequent workflow executions to work for an hour.

To Reproduce

  1. Configure Generic OAuth2 credential with authorization_code against a provider that rotates refresh tokens.
  2. Run workflow successfully.
  3. Wait until access token expiry.
  4. Observe refresh cycle; after subsequent cycle, auth fails requiring reconnect.

Expected behavior

n8n should persist and use latest rotated refresh_token from token refresh response. Workflows should continue without manual reconnect.

Debug Info

Debug info

core

  • n8nVersion: 2.20.6
  • platform: docker (self-hosted)
  • nodeJsVersion: 24.14.1
  • nodeEnv: production
  • database: sqlite
  • executionMode: regular
  • concurrency: -1
  • license: enterprise (production)
  • consumerId: 268c9581-f4d9-44ed-a7be-25c5c834d114

storage

  • success: all
  • error: all
  • progress: false
  • manual: true
  • binaryMode: filesystem

pruning

  • enabled: true
  • maxAge: 336 hours
  • maxCount: 10000 executions

client

  • userAgent: mozilla/5.0 (windows nt 10.0; win64; x64) applewebkit/537.36 (khtml, like gecko) chrome/148.0.0.0 safari/537.36
  • isTouchDevice: false

cluster

  • instanceCount: 1
  • versions: 2.20.6
  • instances:
    • instanceKey: 0cffc1ac-43d6-4469-85cf-116816732522, hostId: main-dec161f067e6, instanceType: main, instanceRole: leader, version: 2.20.6
  • checks:
    • check: hostid-clash, status: succeeded, warnings: -
    • check: lifecycle, status: succeeded, warnings: -
    • check: split-brain, status: succeeded, warnings: -
    • check: version-mismatch, status: succeeded, warnings: -

Generated at: 2026-05-12T17:00:18.159Z

Operating System

Ubuntu 22.04 LTS

n8n Version

2.20.6

Node.js Version

whatever is in image: docker.n8n.io/n8nio/n8n

Database

SQLite (default)

Execution mode

main (default)

Hosting

self hosted

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FAQ

Expected behavior

n8n should persist and use latest rotated refresh_token from token refresh response. Workflows should continue without manual reconnect.

#api#ISR setup#authentication setup#request error#file not found

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