# Testing tool 404 error on access token generation **URL:** \ **Category:** API and Webhooks\ **Created:** [May 28, 2020, 7:04am UTC](https://devforum.zoom.us/t/testing-tool-404-error-on-access-token-generation/19347 "2020-05-28T07:04:42Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![revanthgss](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/revanthgss/32/9377_2.png) [@revanthgss](https://devforum.zoom.us/u/revanthgss)\ **Post date:** [May 28, 2020, 7:04am UTC](https://devforum.zoom.us/t/testing-tool-404-error-on-access-token-generation/19347/1 "2020-05-28T07:04:42Z")
**Description** I am getting a 404 error while trying to generate access token through the testing tool **Which App Type (OAuth / Chatbot / JWT / Webhook)?** OAuth **Which Endpoint/s?** /oauth/token **Screenshots (If applicable)** This is the /oauth/callback/success?code=xxxxxxxx page ![image](https://us1.discourse-cdn.com/flex016/uploads/zoomdeveloper/original/2X/4/486860856f1d480ee729395b0c0beec095d2a561.png) **Additional context** I think there is some issue with /oauth/callback/success endpoint ---
**Author:** ![Phillip](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/phillip/32/9414_2.png) [@Phillip](https://devforum.zoom.us/u/Phillip)\ **Post date:** [May 29, 2020, 6:42pm UTC](https://devforum.zoom.us/t/testing-tool-404-error-on-access-token-generation/19347/2 "2020-05-29T18:42:44Z")
Hi @revanthgss, What are you using for your OAuth Redirect URL? Are you using `https://next.stoplight.io/oauth/callback/success`? Phillip ---
**Author:** ![DeveloperBot](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/developerbot/32/12632_2.png) [@DeveloperBot](https://devforum.zoom.us/u/DeveloperBot)\ **Post date:** [August 21, 2020, 9:37pm UTC](https://devforum.zoom.us/t/testing-tool-404-error-on-access-token-generation/19347/3 "2020-08-21T21:37:42Z")