Every year, UW-IT will ask you to "re sponsor" or provision a share netid's services. In these videos it shows how to do the sponsorship and how to find out who the owner is (you can only sponsor a netid that you're the owner of).
Part 1: (provision.uw.edu) https://drive.google.com/open?id=1jkd-iqO-Dufw2Fdkg9r5k8Igtqi_9iiz
Part 2: (MyUW, "who is the netid's owner") https://drive.google.com/open?id=1nHiBlE8aUYEocKZqBF2VHdiiJ7aVCFIG