When some users access the Confluence Gadget through Jira Dashboard, they are not able to see the Confluence content under the gadget. It prompts the user to login and authenticate and later throws an error stating, problem authenticating user.
The application links are working fine, the user can login to both Jira and Confluence using his credentials, but through this method he gets the error.
Also the user profile -> settings -> View Oauth Access Tokens -> Authorized applications show as None to user.