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If your version of MakeMKV is using an expired or revoked host certificate, newer discs will trigger the "Volume key is unknown" error because the disc actively rejects the software's request for data.
If you are seeing this message, don't panic. You haven't broken your drive, and your disc isn't necessarily faulty. You have simply run into the ongoing "arms race" between encryption protocols and ripping software. makemkv volume key is unknown