Final Fantasy has been multiplatform during the 360 generation with the XIII saga and on Xbox One with XV, they got remasters of all old classics.
XIV didn't happen because of Microsoft’s policies.
It's basically the FF7 Remake project they're missing and the half-disappointment FFXVI.
The fanbase was not built in general because there is no presence in Japan and because Xbox has always positioned themselves like a dude bro console, people interested in JRPGs have never considered Xbox like a valid platform in general not just for FF.
At this point the move is out of time, out of place, out of reality.
They bring titles on Xbox when the platform is almost dead and the platform holder is bringing their titles elsewhere

It's a scrape the bottom of the barrel move that will lead to nothing.
Square Enix needs to:
1) Decide what Final Fantasy should be and stop chasing trends by constantly alienating fans (action/ non action, mature/teen drama, open world/linear).
2) Release high quality games like Rebirth regularly and try to reach all the new generations of gamers they have completely missed in a decade of fuckups.
3) Focus on the right platforms aka PlayStation, PC and Switch 2 in Japan.