How to sync Trakt on all apps

I use Trakt on STermio and Flix Vision. I just started Flix Vision and I am not sure how to get Trakt synced to that application.
Any help would be appreciated.

Have you followed all of the steps listed here: How do I connect my media center, add-ons or apps using a PIN code?

Might not be a Trakt issue, you might also need to reach out to the third party apps support to see they can help.