After having to deauthorize and authorize my kobo aura many times, I received a message telling me I had too many devices on my account and so started a chat. Eventually, the agent understood that i only had one kobo aura that i had to keep reauthrorizing and they fixed my account so i could activate again.
When I try to download books now, i get another message telling me : This book is protected by ADRM, because you previously deauthroized your eReader, you need to reimport the book using ADE.
I have tried downloading new books and get the same message, even though they were borrowed from library and downloaded after i reauthorized my eReader.
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