Cannot change sender name in Mail app, "send messages using this name" setting is missing?

[Ethan_Riddle]

My Gmail account's name was updated a long time ago, and I didn't realize when I sent emails from the Mail app they were still showing up as being sent from the old name. I went into the settings to change it, but the option to change the display name is not there. It is my main email account. How do I update this name? I am not referring to the "Account name" in the picture.To be extra clear: I have changed the name on my Microsoft account, my Gmail, my PC profile, Skype, even my Xbox— everywhere that I can think of that the Mail app would be sourcing this name from has been updated. So eithe

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