Error message: Fulfill:2004 This license has already been fulfilled by another user. I need to read on 3 devices. I could until I upgraded from 4S to 6 plus. Can you help

I just upgraded my iPhone 4S to a 6Plus.  I also have an iPad2 and an iPad Mini.  I read on all 3 devices depending on where I'm going at the time.  In my OverDrive settings on my iPad/Mini it says it is authorized by Adobe ID <and my email address>.  On the 6Plus settings it says it is authorized by OverDrive account <and my email address>.  How do I get the Adobe ID authorized on my 6Plus.  Please??? and Thank you.

Ellen