Users can log in to the mobile apps, Release Portal, and iPrint Portal only in the FQDN format (cn=admin,o=microfocus). To enable logging through the CN format, you must modify the trustee rights of the user container:
Login to iManager (https://<IP Address or host name of iPrint Advanced server>/nps).
Under Roles and Tasks, click Rights > Modify Trustees.
Browse and select the user container whose trustee you want to modify.
Click Assigned Rights link for that trustee.
To add the CN property, click Add Property, then click Show all properties in schema and click OK.
In Modify Trustees, select Inherit for CN property, then Done and OK.