Update 10/27/17- This issue has been resolved.
It has been brought to our attention that AuthID URL in LearningExpress Library MARC records brings up a 404 error. This is a known service issue to EBSCO and they are working on a solution. We will update you when we have more information
Meanwhile, here are a couple of alternatives to access individual titles:
1. If patrons run into the access issue by coming from the individual catalog record, the 404 error can be fixed by clearing the cache on their browser and then restarting it.