The new Tizen TV 6.5+ does not support H.Browser or SSSP anymore.
All the apps that are built on SSSP and H.Browser needs to be migrated to the TEP API.
The Samsung Support forums have also been migrated by Samsung from Samsung D Forum to Samsung Developers.
The new Developers Documentation portal URL: https://developer.samsung.com/hospitalitydisplay
You can sign-in using your organization’s account email and password which you had created during signing up for TBM
The detailed instructions on the API are in the PDF: Guide