Unable to install games to secondary hard drive through the Xbox app or MS Store

Just to confirm, you're unable to install it on Xbox app and MS store? Are you playing the game through the game pass?

Final status - installing through the MS Store seems like workaround for now.

Game works after installing this way through the Xbox app.

Thank you for contact us! I'm Anderson, an Independent Consultant and a Microsoft user like you.

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If you're unable to install Valorant via the Xbox app, here are a few more steps you can try:

Restart your computer and try again.

Check if there's a current outage or maintenance with the Xbox servers by checking the Xbox Live status page.

Check if there's enough space on your hard drive for the game installation.

Disable your antivirus software temporarily and see if that helps.

Try installing the game through the Microsoft Store app directly instead of the Xbox app.

There is an article here that talks about installing Windows Store Apps onto secondary drives. Try the steps here, and let us know if
they work for you!

If you are talking about installing games, you can do that on your hard drive, through a flash drive or to an Xbox 360 4 GB console.

Please check Install, play, or delete a game on your Xbox 360 hard drive | Xbox Support for more info.

However, f you are talking about saved games you can just store them through the cloud: Store your Xbox 360 saved games in the cloud | Xbox Support