How to update users email via API if you have only username?

[BubbaLovesCheese]

Is there a method to update a user's email address via the API if I have only their username?

I see that I can POST and update to their email using their ID : /api/users/{{userid}}

But can I GET their userid from their username somehow?

What would be the method to make this work?

Thanks.
How to update users email via API if you have only username?

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