Numbers 13:11

לְמַטֵּה יוֹסֵף לְמַטֵּה מְנַשֶּׁה גַּדִּי בֶּן סוּסִי

From the Tribe of Joseph, of the tribe of Menashe, Gadi the son of Susi.

Two Tribes were descended from Joseph: Ephraim and Menashe. And yet, when naming the 12 spies, the Torah mentions Joseph when naming the spy from Menashe, and not when naming the spy from Ephraim. The Daas Zekeinim explains that Joseph got in trouble for speaking lashon hara against his brothers. His descendant from Menashe, Gadi ben Susi, shared that trait, as he spoke lashon hara against the land of Israel. The spy from Ephraim, however, was Joshua. He was one of the two spies that did not speak lashon hara, so Joseph’s name is not mentioned in that context.