Getting Started with BIG-IP Next: Configuring Instance High Availability

i have both n1/n2 nodes in central manager and both show healthy. I follow these steps and when cm is trying to create the ha I get an error that says "unable to connect to the https server on peer node ip x.x.x.x" pairup failed.  I checked our firewall logs and see no communications from the central manager to this ip. Also the ctrl plane ha, data plane ha, dataplane-ext and dataplane-int vlans are all on the same router with no acls so nothing should be blocking their access.  Any idea's on what would cause this issue?