The preferred identifiers supported include the legacy
eduPersonPrincipalName attribute and the newly-proposed SAML
subject-id attribute. The latter is ideal if a name and email address are included, while EPPN is best if provided by itself because of the strong need to publically identify contributors in these collaborative tools.
If use of a public identifier is a problem due to privacy restrictions, we recommend use of the newly-proposed SAML
For historical reasons, we do support the legacy pairwise identifiers that fall under the
eduPersonTargetedID and SAML
persistent NameID headings, but they are strongly discouraged.