your ereader is not authorized to open this book

hello, Until yesterday, I was using ADE quietly to transfer books borrowed from the MLOL platform. the error signal "your ereader is not authorized to open this book" appeared last night during a transfer. I have tried everything. I canceled the permissions and gave them back, I reinitialized the kobo, I reinstalled ade but the problem is always the same. I tried to download other books but with all of them it gives me the same error. I tried to change pc but the error persists. I have no more ideas. what do you recommend me to do?