I would like to export the Yammer stats through the Yammer API by using Nintex and I keep on getting an "Unexpected error has occurred" message. I registered the app and got my client code. I then use a web call in Nintex workflow to authenticate the app first and then the next step would be to get the user stats.
I follow the process as set out on the Yammer API page - https://developer.yammer.com/docs/oauth-2.
When I past the URL in the browser all seems to work fine and it takes me to my redirect URL - https://www.yammer.com/oauth2/authorize?client_id=[:client_id]&response_type=code&redirect_uri=[:redirect_uri]
But when I run it from SharePoint I get the Unexpected Error has occurred message and when I capture the error message and write it to history I get this message
Error performing web request. The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel.
Any idea where I need to look to resolve this?