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Edited since the original question was edited with the correct studio that owned xmen

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edited Jun 25, 2021 at 20:02

This article by the LA Times has a good explanation which can be summed up with

Disney’s acquisition of Fox in 2019 changed that. Fox’s separate “X-Men” franchise is no more, and Marvel Studios is free to incorporate any of those characters into the MCU.

And to clarify your question it isn't Sony that owns the rights to the X-Men movies. It was Fox studios.

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created Jun 25, 2021 at 19:32

Gabriel

This article by the LA Times has a good explanation which can be summed up with

Disney’s acquisition of Fox in 2019 changed that. Fox’s separate “X-Men” franchise is no more, and Marvel Studios is free to incorporate any of those characters into the MCU.

And to clarify your question it isn't Sony that owns the rights to the X-Men movies. It was Fox studios.