Facebook Container isolates your Facebook activity from the rest of your web activity in order to prevent Facebook from tracking you outside of the Facebook website via third party cookies.
We have a feature coming very soon that will allow users to manually add sites to the Facebook container. That should resolve this issue. Track our progress on that feature here: #422
This URL (https://oculusvr.zendesk.com/auth/v2/login/set_cookie) must open inside the Facebook container in order to login to the ticket system (https://tickets.oculusvr.com/hc/en-us/requests/new).