Slack Integration is not working

[Athena Admin]

I receive this error message when I try to connect Slack and my JIRA instance

redirect_uri did not match any configured URIs. Passed URI: http://ilte10:8080/slack/oauth/redirect/T0F6T75E2

[Sudarshan]

Hello @Athena Admin 
I hope the issue is resolved by now.

but if it still exists
try the below:
1. check which integration have you installed, the preferred integration is by atlassian
https://marketplace.atlassian.com/apps/1216863/jira-cloud-for-slack-official?hosting=cloud&tab=overview

2. your issues more looks like a Authenticator problem, did you happen to check with your company network admin?