To visualize Ruben's comment, please have a look at the image below.


You can try the workaround in this Meta answer - it involves changing your profile email to the desired address, then using the password reset function to initialise the account.


Click your user avatar at the top of the screen to go to your profile/activity page. Click Edit Profile & Settings Change your "Display Name" to the desired value, and Save. (You need to do this from the full desktop website. You can't do it from an app or from the mobile web site.)

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