Internal Stakeholders of a business

Why do you need to identify your Internal Stakeholders? Internal stakeholders are key to success, as Gary Heerkens points out: One thing that makes internal stakeholders particularly important is that the perceived success of your project [business/strategy/department] is often judged by the perceived satisfaction of internal stakeholders.Source: Internal Stakeholders | Who are Internal Stakeholders? https://www.stakeholdermap.com/internal-stakeholders.html