Formula Field "Email" Output or Allow Email Notifications to go To value from formula field

We have a formula field that will always output an email address from one of two other existing email address fields:

However, when try to put use the output of this formula field in Email Notifications, it is not showing up:

There needs either be a Formula Return Type of "email" or Zoho really needs to allow non-email fields to be used in the "To" field of email notifications.

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