I have the same problem. Customer typo and now I cannot change there email address.
What is the point of the edit button when we cant even change any contact info
Why? Shopify Why??.....
Ugh... So fustrated!
Someone please come up with a solution
Also needing a fix to this. I have a customer that created a new account instead of resetting their password. Has purchased something on both accounts and now I can't merge them.