It’s always good to get more buy-in/agreement than necessary. A product I worked on required only the CMO & CPO buy-in, but I went out of my way to ensure the COO & the CFO also agreed on the value of the idea.
Then, when there were some tough times and the backlog had to be pruned, the COO & the CFO stood by the idea, even though the original stakeholders wanted to take it out.
Remember, help can come from unexpected places. Position yourself for success…