A large manufacturer has piloted Microsoft 365 Copilot with an enthusiastic IT team and a strong AI champions network. Six months in, usage has plateaued: business units treat Copilot as an optional IT experiment, funding for expansion is contested each quarter, and departments have not embedded Copilot into their own performance goals. The adoption team asks the AI Transformation Leader to identify the most fundamental barrier they must address to move beyond the plateau. Which barrier is it?