I don't know if this forum is active at all because I received ZERO responses from the community, but I've found a fix to the locked notebook on the Android issue I was having...
I found a fix to the Evernote Android software bug. On the web version, I made the notebook that is hidden and locked on the Android app the default notebook and when I went back to my Android app, the notebook is now available. Switched back to my original notebook as the default notebook and now all the notebooks are available. I hope this helps if anyone is having the same issue.