Can't erase authorization on ADE on Mac

I am trying to deauthorize on Adobe Digital Edition because I bought a DRM-protected ebook with a different email, which I have an adobe ID for too. So now I want to use my other email to authorize ADE with, but I can't erase the current authorization. I get the message "Unable to erase authorization, try again after som time". And I keep getting that message. What to do? I have a Mac.