There are two factors here.
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Small SE games sell like shit on Xbox. SE does not consider it economically significant enough to port them, unless Microsoft is willing to pay to have it done through a gamepass deal or similar.
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Certain medium or large games have exclusivity deals with Nintendo or Sony. Octopath and Triangle Strategy are examples of Nintendo timed exclusivity deals; FF7 remake and FF15 are examples of Sony timed exclusivity deals.
In combination, Square Enix Japan titles come to Xbox late or sometimes never. SE-Europe does not have the same issues however. The Spider-Man DLC exclusivity deal is the only thing they took recently. Otherwise it’s all day and date on Xbox.
This is all business. It’s nothing personal.