Admin Console - stop using email as account identifier

Managing the Admin Console for a higher-ed institution, we often see cases where members of our community change their email, usually accompanied by a change of name.  This presents a problem when the primary identifier of an Adobe account is their email address, even though we use Federated ID.  In particular, it causes an issue in Adobe Acrobat Sign where the user loses access to their previous account, including completed and in-progress agreements.  This has been noted as a security concern as well.  We would prefer for the Adobe Admin console and associated Adobe products to have the ability to use some other attribute, such as the campus ID number, as the primary account identifier instead of email. This would alleviate the problem with change of email address and security concerns.