Can you please try with the latest version of ADE.
I am using the latest version,. I only downloaded the program yesterday! its 4.5, is that the newest?
Can you please confirm whether ADE & KOBO is authorized with same ID?
Also please try below solution.
- Deauthorize KOBO
- Mount in ADE and Authorize
- Now try moving the book and open in KOBO
they are authorized with the same account. I have already erased the authorization, reauthorized, erased the books tried again, uninstalled ADE tried again, tried ADE V 3 and V 4.5 tried again.
I have also factory reset the Kobo twice with no change.