Attribute mapping on new SP3 install

[HCUK eLearning]

I have just installed a new SP3 on Windows. For some reason, the
eduPersonPrincipalName is not coming through (when, using PHP, I render out
the HTTP headers) using the default attribute-map.xml file. mail and
eduPersonScopedAffiliation are, and my IdP is definitely sending the eppn
value.

Any ideas?

TIA
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