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IMPORTANT: you must specify exactly one attribute whose id is "remoteUseruserId". The Shrine SP code will look for a request attribute of that id to populate the user name in the code (which appears in the user account "badge" at the top-right corner of the UI). In the present case (HMS idP & Shrine SP), the attribute which maps to remoteUser is "ecommonsId" because that is what the HMS iDP returns, along with "Email", "Firstname" and "Lastname".

<Attributes xmlns="urn:mace:shibboleth:2.0:attribute-map" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<!-- The 'name' attributes need to match exactly what your IdP sends in
its response to your (successful) AuthnRequest
-->

<Attribute name="[idP's name for the user id]" id="userId"/>

</Attributes>

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