MKB20_v77_HOUSE_OF_THE_DRAGON_S1_D3_FB0F.tgz Have you tried downloading the latest KEYDB.cfg file, copying it into MakeMKV's data directory (i.e. where MakeMKV also writes its TGZ dump files) and restarting MakeMKV? I did. I tried it shortly after posting and just tried it again with a new download...
Originally purchased this set from Amazon (Steelbook) during Black Friday, but disc 1 was damaged and couldn't be fully read. The other discs had no issue and backed up just fine. Returned to Amazon and have been waiting for it to go back onsale for a decent price. Was alerted 2 weeks ago that Gruv ...