I didn't know my Adobe ID so I recently had it emailed to me so I don't know the Adobe ID that I used originally to download my library ebooks.

I didn't know my Adobe ID so I recently had it emailed to me so I don't know the Adobe ID that I used originally to download my library ebooks. 

I get this message:  This title has been activated using a different ID. Try registering this device with the ID you originally used to download the title.

I don't have any trouble with my MAC, iPhones or iPad. I am just having trouble with my older Blackberry Playbook.

I have not been asked to use my Adobe ID when using my Apple devices.

I just download my ebooks without using anything from Adobe

I want to know how to find my ID that I used to download my ebooks so I can use it to access ebooks on the playbook