I can't read my books on my tablet.

Please. I download several books on my pc and Adobe Digital Editions. I changed support to read and want to read them on tablet with PocketBook or UniversalBookReader. I can't read my books on tablet. When I try to read some books I PURCHASED with DRM it ask me confìrm adobe account, I did, but it can't allow to read them. Thank you in advance for suggestions. Lucia