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Please transfer this thread to other subforum. This is not related to POCOPHONE.
For your question, you can change your nickname by clicking top right corner in PC browser. Go to c.mi.com/oc
Maybe you can change in app too.
Seems like your nickname has been changed already since when I saw your profile and I could see your ID and nickname are different.The id shows in Phone, ID shows in Mi Community and nickname should be same if it has not changed.