https://myjiracloud.atlassian.net/secure/Dashboard.jspa.?error=redirect_uri_mismatch&error_description=The+redirect_uri+MUST+match+the+registered+callback+URL+for+this+application.&error_uri=https%3A%2F%2Fdeveloper.github.com%2Fapps%2Fmanaging-oauth-apps%2Ftroubleshooting-authorization-request-errors%2F%23redirect-uri-mismatch
Hi Angela,
It may have been due to a recent issue with the integration of Jira with GitHub. It has been fixed in the meantime and should be working now.
If not try recreating the Application Link and then refresh the link via "Connected developer tools" menu from Jira.
Thanks,Paulo
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