Getting OUAUTH_problem=token_rejected even after reseting it


Recently our phabricator instance which has JIRA integration enabled started dishonouring the token generated.
When ever anybody clicks on Link External account JIRA, we get below error

Parse/1] The remote host returned something other than an HTTP response: HTTP/1.1 200
Server: Atlassian Proxy/0.1.330
Vary: Accept-Encoding
Content-Type: text/plain;charset=UTF-8
Strict-Transport-Security: max-age=315360000; includeSubDomains; preload
Date: Sat, 01 Sep 2018 21:28:05 GMT
X-AREQUESTID: *****************************
X-XSS-Protection: 1; mode=block
Transfer-Encoding: chunked
X-AUSERNAME: anonymous
X-Content-Type-Options: nosniff
Connection: keep-alive
Set-Cookie: atlassian.xsrf.token=************

on the server error page we can see it stated ouauth_problem=token_rejected

No changes were done on phabricator or JIRA.

Already deleted the link and recreated in JIRA but no luck

What could the issue for this error. Any help would be highly appreciated.