# 500 Internal Server Error during App Authorisation

**URL:** <https://devforum.zoom.us/t/500-internal-server-error-during-app-authorisation/15962>\
**Category:** API and Webhooks\
**Created:** [May 4, 2020, 10:45am UTC](https://devforum.zoom.us/t/500-internal-server-error-during-app-authorisation/15962 "2020-05-04T10:45:45Z")\
**Posts on this page:** 4\
**Page:** 2

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**Author:** ![lwylie](https://avatars.discourse-cdn.com/v4/letter/l/5daacb/32.png) [@lwylie](https://devforum.zoom.us/u/lwylie)\
**Post date:** [February 8, 2021, 10:50pm UTC](https://devforum.zoom.us/t/500-internal-server-error-during-app-authorisation/15962/21 "2021-02-08T22:50:48Z")

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Hello, we are having this issue as well. One user got an authentication failure while others had no problems. The error code was 500 - INT\_e2ec156707998dfd. We tried uninstalling the app and reinstalling it. The error code is now 500 - INT\_d736213a390bce66.

To confirm, we are using the same replication steps as above and tried clearing cache. The Slack app is showing in the user’s Zoom marketplace and the “pre-authorize” button is toggled. There seems to be no issue when clicking on Manage or viewing the settings. But when the user types /zoom in Slack, it takes them to the sign-in page to authenticate, and says authentication failure.

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**Author:** ![MaxM](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/maxm/32/42303_2.png) [@MaxM](https://devforum.zoom.us/u/MaxM)\
**Post date:** [February 9, 2021, 7:44pm UTC](https://devforum.zoom.us/t/500-internal-server-error-during-app-authorisation/15962/22 "2021-02-09T19:44:04Z")

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Hey @lwylie,

Thank you for reaching out to the Zoom Developer Forum. I just have a couple of questions to help troubleshoot the issue:

1. Is this a new implementation or has this worked in the past?
2. Have you confirmed you meet all the prerequisites for the [Slack Integration](https://support.zoom.us/hc/en-us/articles/205153255-Setting-Up-Slack-Integration)?

![image](https://us1.discourse-cdn.com/flex016/uploads/zoomdeveloper/original/3X/9/f/9fa069f076f15e18f266ffad87d04266e5e6b840.png)

Thanks,  
Max

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**Author:** ![lwylie](https://avatars.discourse-cdn.com/v4/letter/l/5daacb/32.png) [@lwylie](https://devforum.zoom.us/u/lwylie)\
**Post date:** [February 9, 2021, 8:05pm UTC](https://devforum.zoom.us/t/500-internal-server-error-during-app-authorisation/15962/23 "2021-02-09T20:05:34Z")

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Hi @MaxM,

As I said, it works for some users. Are you saying that EVERY Zoom account linked to each individual Slack account must be paid? As this is not the case; many are able to access Zoom in Slack on a free Zoom account.

It is a new implementation and only one user is encountering this issue. In fact, the matching e-mail address does not seem to actually be a requirement? In this case, though, the user in question does have matching e-mail addresses.

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**Author:** ![MaxM](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/maxm/32/42303_2.png) [@MaxM](https://devforum.zoom.us/u/MaxM)\
**Post date:** [February 10, 2021, 9:19pm UTC](https://devforum.zoom.us/t/500-internal-server-error-during-app-authorisation/15962/24 "2021-02-10T21:19:07Z")

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Hey @lwylie,

Please send an email to [developersupport@zoom.us](mailto:developersupport@zoom.us) referencing this thread. Please also include the email of a user that is encountering this issue as well an email of a user where this is working as expected.

Thanks,  
Max

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