Good advice from David Cummings:
One area that’s under appreciated by many entrepreneurs is the value of educating team members on how different aspects of the business [...]. There’s value in taking time to make sure everyone has at least a cursory understanding of different departments and key drivers of the business model. [...]
People inherently want to grow and learn as part of their own journey, and providing a more broad-based education in a startup helps. Spend time educating the team and the team will return the favor with more ideas and innovation.
I've seen this in action several times: when behavior from the sales team is perceived as being wrong and/or stupid by the client project team, a short explanation of its rationale usually goes a long way into alleviating concerns.