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In the context menu of the service provider, select "Edit"
Change the "NameID Format" to "Down Level Logon NameMap to the following attribute"
Select "email" as the "Attribute"
Click Save
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...
In the context menu of the service provider, select "Edit"
Change the "NameID Format" to "Down Level Logon NameMap to the following attribute"
Select "email" as the "Attribute"
Click Save