I have tried to uninstall Calibre and the plugin. However, when I reinstall Calibre and install the plugin again, it appears as AUTHORIZED with the anonymous ID that was giving me an error when trying to return the books. I would like to deauthorize the device and authorize it again. Regarding your question about Libby, I am from Spain and I return all the ebooks from my digital libraries without any problem... the issue arises when I try to return those from a specific library, I get this error and cannot return them neither from Calibre nor from its website.
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