Is there a list of valid values for the "Type" field? If i want to assign licenses to physical or virtual servers, nothing seems to work (Computer, Physical, Virtual).
If you click on your user name on the right top corner of the SLM and choose Help, you will find a User Guide - Data Import Field Description. In that document the attributes and values are described.
If i remember correctly, you have to choose "datacenter" as Type and the computername or datacenter name as "Assign to".
Hope that helps.
I have created a document that outlines this please see License Assignment Import
Retrieving data ...