They kinda did tho:

Leaders of the Uncommitted National Movement, which supported voting “uncommitted” on Democratic primary ballots rather than voting for Biden, briefly spoke with Harris at the Detroit rally.

“Michigan voters want to support you, but we need a policy that will save lives in Gaza right now. I meet with community members every day in Michigan who are losing tens and hundreds of family members in Gaza. Right now, we need an arms embargo,” Layla Elabed, a co-founder of Uncommitted, told Harris, according to the group.