Here are some possible solutions to fix the issue with all the patrons signing into EZproxy with the username of Shibboleth.:
If auth:NameID ne ""; Set login:loguser = auth:NameID If auth:NameID ne ""; Set login:user = auth:NameID
2. See if the Why is my username showing as shibboleth after upgrading EZproxy help article fixes the issue.
Please contact OCLC Support for any questions.