The following misconfiguration message can appear when a site-to-site connection is not attached to two site perimeter networks:
Site to site connection <WANConnectionName> in
<SiteName> is not connected to endpoint
Typically, this adjustment message appears when you have modified the capacity model by removing a WAN connection, disconnecting two sites.
Use the To add a site-to-site connection in the Model Editor procedure in the How to Add a Site-to-Site Connection or a WAN Connection in the Model Editor topic to add a network connection between the two sites.