Wordpress Login frontend for Rocket Chat

Is there anybody online who has succeeded in using Wordpress to login to Rocket Chat? I want to login in Wordpress on a different server and then click on a menu link “chat” and login automatically at the Rocket Chat server.

I tried almost every option and plugin but none seem to work…

Without this I cannot use Rocket Chat the way I want to, so if somebody has this working and is willing to share the settings I would be very gratefull.