I have tried everything. ADE will not download EPUB or ACSM files. I have tried the free EPUB downloads from Adobe as well as lending from public library. I have spent hours in support with Mac and Barnes and Noble. ADE recognizes my Nook Glowlight Plus, however, every time I try to add a file to the library I get this message: E_ACT_NOT_READY I have deleted and reinstalled ADE on computer as well. ADE is authorized on all devices. I greatly appreciate any tips and suggestions. Thanks!
I'm experiencing the same thing on my Samsung Galaxy S10+ - no books are syncing regardless of my attempts to uninstall, deregister, toggle between sync or not. I have however discovered that 2-factor authentication must be disabled to use ADE or similar.