Hello,
I was wondering if anyone successfully got the outline application working with authentik? I followed a guide on YouTube and the authentik outline documentation, but I redirected to https://outline.domain.tld/?notice=auth-error with the below error.
Authentication failed – we were unable to sign you in at this time. Please try again.
Here are some of my configuration:
outline Provider
- Authorization flow: default-provider-authorization-explicit-consent (Authorize Application)
- Redirect URIs: Strict
https://outline.domain.tld/auth/oidc.callback - Signing Key: outline (Generated via authentik)
- Encryption Key: outline (Generated via authentik)
- Authentication flow: default-authentication-flow (Welcome to authentik!)
- (everything else left as default)
I got the below error from outline log for Invalid key length on the SECRET_KEY environment variable, but on the app configuration, I set the Secret Key field to the correct length of 64 characters.
outline Log
2025-07-06 16:06:03.522896+00:00{"error":"Invalid key length","level":"error","message":"Failed to encrypt database column (accessToken). The SECRET_KEY environment variable is not the correct length.","stack":"RangeError: Invalid key length\n at Cipheriv.createCipherBase (node:internal/crypto/cipher:121:19)\n at Cipheriv.createCipherWithIV (node:internal/crypto/cipher:133:3)\n at new Cipheriv (node:internal/crypto/cipher:234:3)\n at Object.createCipheriv (node:crypto:143:10)\n at Object.createCipheriv (/opt/outline/node_modules/dd-trace/packages/datadog-instrumentations/src/crypto.js:29:27)\n at UserAuthentication.set (/opt/outline/node_modules/sequelize-encrypted/index.js:48:33)\n at UserAuthentication.set (/opt/outline/build/server/models/decorators/Encrypted.js:55:59)\n at UserAuthentication.set (/opt/outline/node_modules/sequelize/lib/model.js:2256:32)\n at UserAuthentication.set (/opt/outline/node_modules/sequelize/lib/model.js:2241:18)\n at UserAuthentication._initValues (/opt/outline/node_modules/sequelize/lib/model.js:156:10)\n at new Model (/opt/outline/node_modules/sequelize/lib/model.js:116:10)\n at new Model (/opt/outline/node_modules/sequelize-typescript/dist/model/model/model.js:14:9)\n at new Model (/opt/outline/build/server/models/base/Model.js:23:5)\n at new IdModel (/opt/outline/build/server/models/base/IdModel.js:19:5)\n at new UserAuthentication (/opt/outline/build/server/models/UserAuthentication.js:29:5)\n at new user_authentication (/opt/outline/build/server/models/decorators/Fix.js:21:7)"}
2025-07-06 16:06:03.523873+00:00{"error":"Invalid key length","level":"error","message":"Error during authentication","stack":"RangeError: Invalid key length\n at Cipheriv.createCipherBase (node:internal/crypto/cipher:121:19)\n at Cipheriv.createCipherWithIV (node:internal/crypto/cipher:133:3)\n at new Cipheriv (node:internal/crypto/cipher:234:3)\n at Object.createCipheriv (node:crypto:143:10)\n at Object.createCipheriv (/opt/outline/node_modules/dd-trace/packages/datadog-instrumentations/src/crypto.js:29:27)\n at UserAuthentication.set (/opt/outline/node_modules/sequelize-encrypted/index.js:48:33)\n at UserAuthentication.set (/opt/outline/build/server/models/decorators/Encrypted.js:55:59)\n at UserAuthentication.set (/opt/outline/node_modules/sequelize/lib/model.js:2256:32)\n at UserAuthentication.set (/opt/outline/node_modules/sequelize/lib/model.js:2241:18)\n at UserAuthentication._initValues (/opt/outline/node_modules/sequelize/lib/model.js:156:10)\n at new Model (/opt/outline/node_modules/sequelize/lib/model.js:116:10)\n at new Model (/opt/outline/node_modules/sequelize-typescript/dist/model/model/model.js:14:9)\n at new Model (/opt/outline/build/server/models/base/Model.js:23:5)\n at new IdModel (/opt/outline/build/server/models/base/IdModel.js:19:5)\n at new UserAuthentication (/opt/outline/build/server/models/UserAuthentication.js:29:5)\n at new user_authentication (/opt/outline/build/server/models/decorators/Fix.js:21:7)"}