Coordination failures occur when people lack some way to jointly coordinate their actions to reach a (n)

The answer is "mutually beneficial outcome or equilibrium"

"Coordination failures occur when people lack some way to jointly coordinate their actions to reach a mutually beneficial outcome or equilibrium."

In a negotiation or in a project management, both parties or all members must coordinate to have a win-win situation. For a successful outcome, there must be trust so that there is a willingness to carry out agreed actions, and to compromise.