I hardly ever get that message when in FB, but then Token videos there are pretty rare. There was a tourism one that worked a week ago, and unlike many I could watch it more than once. But that's blue moon, usually there's only some for boosters.

I get the unavailable/invalid link more in the videos that watching 3 gains a Token. On that same sponsor thingy it works best in Firefox,.. really have issues when I try in Chrome, like it not crediting I watched and the button for next not appearing.