Clarify which email addresses may be set as primary #159
Description
Issue overview
This relates to the Changing your primary email address article. A user found that they could not change their primary email address to an email that is already set to be their backup email address.
Content strategy plan
- Add some text before the procedure that you cannot choose your backup email address as your primary.
- To work around this, we recommend setting backup to "allow all verified emails"