"Function unaccent(text) does not exist" in update trigger

I've created a trigger for table x1 to update a column y with the expression to_tsvector(unaccent(x1.col1 || ' ' || x2.col1)). This trigger function throws: > function unaccent(text) does not exist Why would this function not exist when a trigger is called, but exist when executed manually? I'm using Supabase to manage this database.