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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 pairwise-id attribute.

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.