Maybe this is already common knowledge, but it looks like some titles that are available on FreeVee do not show up as such when you search for them. For example, a few minutes ago, looking for Red Sparrow, I did what I usually do - searched IMDB, where I saw it was on FreeVee. "Sweet!" quoth I, "I can download it with AnyStream to get rid of the commercials!"
But, when I opened AnyStream and searched for it, it didn't show up - only the rental version! I brought up Amazon in Chrome, searched for it that way, and saw the same thing.
Curious then, I went back to IMDB, and tried clicking the FreeVee link. It brought up Red Sparrow, all right, on FreeVee, on Amazon. So, I closed the player, then added it to my watchlist... and was able to use that to get to it in AnyStream. Yay workaround!
TLDR
It looks like some things available free with commercials through FreeVee don't show up in Amazon searches. You can work around by using the link from IMDB to get to it on FreeVee on Amazon, and then saving it to your watchlist. Then in AnyStream, you can go to your watchlist on Amazon and find it.
But, when I opened AnyStream and searched for it, it didn't show up - only the rental version! I brought up Amazon in Chrome, searched for it that way, and saw the same thing.
Curious then, I went back to IMDB, and tried clicking the FreeVee link. It brought up Red Sparrow, all right, on FreeVee, on Amazon. So, I closed the player, then added it to my watchlist... and was able to use that to get to it in AnyStream. Yay workaround!
TLDR
It looks like some things available free with commercials through FreeVee don't show up in Amazon searches. You can work around by using the link from IMDB to get to it on FreeVee on Amazon, and then saving it to your watchlist. Then in AnyStream, you can go to your watchlist on Amazon and find it.