I have the same issue too.. may be worse
I had installed It Takes Two via XBOX app (I have XBOX Gamepass Ultimate subscription by the way and for EA Games, it must be installed through EA launcher)
Several weeks ago I could play the game without any problem, I haven't played the game for a while until tonight I wanted to play the game again, but ALAS! The game that I had installed didn't show up on either XBOX app or EA Launcher installed game list, but when I browsed for the game in the folder, the game was there.
Both XBOX app and EA Launcher tell me to install the game. Then I tried to install the game, and VIOLA!! I get the same notice.
I can't installed the game! I thought that it was because I actually had installed the game and the app clashed with it, but it turned out that it is not the problem! have tried to uninstall both the game and EA Launcher then I redownloaded EA launcher and tried to install the game again but the problem still exists. This dang EA launcher still gives me this dang notice!
I can't install the game to the other partitions because they running out of space... sad
My issue was exactly like what you described and I have been trying to find a way to fix it for litterally days. The fix has actually been mentioned here but didn't work until just now.
Here is my exact steps
Open the Xbox App, search for the game you have installed and click install, when it launches the EA app and asks you to download it, click cancel. In the EA app search Apex and start the install of Apex Legends. It will start to download. Give it a few moments and boom your missing games will reappear in your collection and you'll be able to play them.
Hopefully this works for you too?
