Although Din was perfectly content with giving the Darksaber to Bo-Katan in The Mandalorian Season 2 finale, he’s not so willing to hand it over to Paz Vizsla. Paz gets frustrated watching Din struggle to wield the Darksaber properly and challenges him to a fight. Before they start duking it out, Paz explains that his ancestor was the one who created the Darksaber in the first place. However, just like Bo-Katan, Paz can’t claim the Darksaber on blood ties alone.
Source: https://www.distractify.com/p/dark-saber-history-book-of-boba-fett