where's my mc java unsername

My Minercaft account just asked me to reset my username, I already set it up last year, and when I log in to the official website again, the username is restored (I purchased Xbox Game Pass)

More information is available in my video: https://www.bilibili.com/video/BV1Pc411m7k4/?spm_id_from=333.1007.0.0&vd_source=ef4d2e19c0c7203807209bcf3785cb8e