The email change button on your account has been greyed out and "temporarily unavailable" for nearly a year now. The only way to change your email was apparently to email support, which the support is absolutely awful. The only response you can get is that they say the feature is temporarily unavailable and to wait for it to come back. My email provider is shutting down it's service in a month and it looks like this email change issue isn't going to be fixed anytime soon as it's been a problem for nearly a year now.
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