Halo 2 Terminal 15

Hi guys, its a bug or something.
Ive gone through all the halo games and collected all of the terminals possible through out the collection.
which is the apparent requirement to unlock the 15 terminal for Halo 2!
when i got to watch it in the halo channel is still say “Play Halo”
No ‘Play’ button.

can anyone help

Got the same thing as well.