Just a heads-up for anyone wanting to change the email address associated with their account, there seems to be a bug in the process that creates a new account with the new email address instead of changing the email on your account
The steps I followed was
1. Go to Profile Settings
Scroll down to Account Management > Change Email Address
Entered in the new email address I want to change to, and click Continue
When the Confirm email address change email arrived, I clicked on the link (Done on a separate device)
When I clicked on the link, I was then taken to a page where I verified my login with a 6digit email code, and then asked to create a username.
It's that last step that seems to be the bugged step I try the process again from step 3, and I can no longer start the flow again. Logging in with an old email address takes me to the usual account, and logging in with the new email address takes me to the new account