# The app host returned HTTP response code 401?

**URL:** <https://community.developer.atlassian.com/t/the-app-host-returned-http-response-code-401/53611>\
**Category:** Jira Cloud\
**Tags:** jira-cloud\
**Created:** [November 12, 2021, 9:51am UTC](https://community.developer.atlassian.com/t/the-app-host-returned-http-response-code-401/53611 "2021-11-12T09:51:41Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Ivana1](https://avatars.discourse-cdn.com/v4/letter/i/7ba0ec/32.png) [@Ivana1](https://community.developer.atlassian.com/u/Ivana1)\
**Post date:** [November 12, 2021, 9:51am UTC](https://community.developer.atlassian.com/t/the-app-host-returned-http-response-code-401/53611/1 "2021-11-12T09:51:41Z")

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Hello everyone,

I have installed an add-on to the cloud instance. Because of some changes made in the code I uninstalled it.

Now when I try to install it again on the same cloud instance I got this kind of error:

The app host returned HTTP response code 401 when we tried to contact it during installation.

From the logs I can see that in the database I have already a client info for that key so the authentication fails.  
How can I resolve this?  
Thank you