It is useful to be able to link the DAX session numbers with the SQL SPID, especially if you want to diagnose who is causing locks, or long running queries. This is one method to get the information.
Before you can link the two pieces of information you need to enable an extra mode on the AOS server(s). On each AOS you want to review the DAX sessions against the SQL SPID you need to complete the following setup.
DAXNigel 