APM - SAML Attributes Blank

Hello,

I am working on implementing a SAML IDP, however I'm running into an issue where the SAML payload is not showing values for the attributes. Example:

<saml2:AttributeStatement>
<saml2:Attribute Name="uid" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:unspecified"
xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion"></saml2:Attribute>
<saml2:Attribute Name="email" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:unspecified"
xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion"></saml2:Attribute>
<saml2:Attribute Name="displayname"
NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:unspecified"
xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion">
<saml2:AttributeValue xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion">email@email.com</saml2:AttributeValue>
</saml2:Attribute>

The attributes as defined in the IDP Config are:

displayname = %{session.logon.last.logonname}

email = %{session_logon_last_email}

uid = %{session.ad.last.attr.sAMAccountName}

What am I missing here?