Showtime Anytime content no appearing in AppleTV

Each show in the Apple TV app has a Details page. Find it in Watch Now or Search. For Up Next, do click-and-hold, then choose Details from the contextual menu. On the Details page, scroll down to How to Watch. Find the available content providers there. See if ‘Showtime Anytime’ is listed, then click that.

If not listed, then go to Settings﹥Apps﹥TV﹥ᴄᴏɴɴᴇᴄᴛ ᴛᴏ ᴛᴠ﹥ to change the On|Off status for supported connectable apps.

I briefly used the AppleTV+ trial of the Showtime add-on and then cancelled it.

The Showtime Channel in the Apple TV app doesn’t depend on the Apple TV+ subscription.

The Showtime Channel in the Apple TV app is a different type of subscription that is not exchangeable with the subscriptions started outside the Apple TV app.

Showtime Anytime (with TV provider) is able to connect to the Apple TV app on the Apple TV box, so that Showtime content can be included the Apple TV app in What to Watch, Up Next, and Search. The Showtime Anytime app still needs to be present on the Apple TV box though. This connecting is not available on third party devices with the Apple TV app.

How do I get the AppleTV to stop using the Showtime add-on and instead use the Showtime Anytime app?

That is only possible on the Apple TV box (4th generation or later), iPhone, and iPad.