The Xbox One has supported Alexa voice commands for over two years, but until now, it was available as an Alexa skill. That means that, while you can use an Alexa-enabled device like an Echo speaker to control an Xbox console, there were some limits to what you could do with it. Most of the features were related to Xbox-specific things, like launching games or turning on the console.
That's changing, though, as Twitter user WalkingCat has spotted a new Alexa app for Xbox on the Microsoft Store (via MSPoweruser). According to the listing, the app supports both the Xbox One and Xbox Series X|S. The app brings Alexa features directly to the console, but as noted in the app's description, you'll still need an Alexa-enabled device to use it.
As for what you can do with it, it should include all the same features as the Alexa skill for Xbox, like launching a game, playing music, and so on. You can also do non-Xbox related things, though, like ask the digital assistant to see a shopping list on the TV or see a security camera feed there.
As Microsoft has moved away from Cortana as a consumer-facing feature, third-party assistants have started expanding their presence on Windows-based platforms. In addition to Xbox integration, there's also an app for Windows 10 PCs - which uses a different Microsoft Store listing - that's bundled with PCs from select OEMs.