If your game is already on Xbox or is still in development but you would like to bring it to Xbox, there is a possibility for financing from Microsoft itself. The following are the necessary steps for pitching:
Step #1 – log in to the developer.microsoft.com page, or, if you don’t have an account, register first (take into account that they are looking for a physical person’s email through the company domain, e.g. marko@gamestudio.hr, not marko@gmail.com or info@gamestudio.hr).
Step #2 – Press the “Become a Partner” button and fill out all the information they ask you to become an ID@Xbox partner and sign the NDA.
Step #3 – Pitch your game for Game Pass or the Developer Acceleration Program here, considering that it’s important for them to learn about both the game and the team:
https://developer.microsoft.com/en-US/games/publish/pitch/welcome
Step #4: Wait 4 weeks for a response from the Xbox team