Useless until they fix login issues
Until Zinio file their login issues the app is useless. Furthermore no response from Zinio and their support team regarding the issue.
Perhaps they are doing this on purpose to force people to use their other app where you have to purchase the magazines from them rather than go through your public library.
Either address the issue or remove the app.
Surlacote about
Zinio for Libraries, v1.3.1