UX and accessibility go hand in hand, without a good UX process creating a usable product, no amount of work on accessibility will make it good for people with disabilities.
You can think of UX as optimising for the majority, and accessibility and scaling out an interface for minorities, but where do those aims conflict? There are interfaces being created for “great UX” that are fundamentally inaccessible. Do they need to be?
At each stage of design there are four questions I ask to ensure an interface is accessible. If you can build those into your process, you won’t get blindsided after launch.