Halo 5 Beta still grayed out Need Help!!!

I cannot access the Halo 5 Beta. The icon on MCC is still grayed out and will not let me select it. I have done some research and hard reset my xbox and also watch one of the Halo: Nightfall videos. Still not working. Any ideas or ways to fix this?

Anyone?

Watch the final episode of nightfall. It will unlock a reward that says play halo5. Click it and it will take you to the store to dl.