# Zoom Phone Issue

**URL:** <https://devforum.zoom.us/t/zoom-phone-issue/146134>\
**Category:** Zoom Apps\
**Created:** [September 2, 2026, 6:18pm UTC](https://devforum.zoom.us/t/zoom-phone-issue/146134 "2026-09-02T18:18:40Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Shubham4](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/shubham4/32/49425_2.png) [@Shubham4](https://devforum.zoom.us/u/Shubham4)\
**Post date:** [September 2, 2026, 6:18pm UTC](https://devforum.zoom.us/t/zoom-phone-issue/146134/1 "2026-09-02T18:18:40Z")

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Same here,

The issue is that **Zoom for Salesforce is working in Production, but we are unable to authorize/connect Zoom with any Salesforce Sandbox org**. I tested this in both our existing QA Sandbox and a brand-new Sandbox, and both return the same error:  
**OAUTH\_AUTHORIZATION\_BLOCKED: Cross-org OAuth flows are not supported for this external client app**

Since we are using the **standard Zoom managed package** , and the same error occurs for multiple users and multiple Sandbox orgs, it does not appear to be user-specific.  
I also found a recent post on the **Zoom Developer Forum** where another user reported the **same error** when trying to authorize the Zoom managed package in a different Salesforce org