Why am I being forced to do a job I strongly dislike at work?

My other process leads understood it and would either not put me on it for years or if I was scheduled I would switch back than or they let someone else do it yesterday tho I was on the schedule to do it after year not doing it and my current process less got mad at me for swapping with someone who can do it best and I can do his job better and in the middle of work questioned m if I swapped and made me get trained on that job I dislike when all this time there was plenty of people doing that job

Why am I being forced to do a job I strongly dislike at work?
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