This occurs any time the VSM cannot communicate with the VEM. Are you using L2 or L3 deployment? I resolved a lot of niggly issues once I moved to L3.
Does the VSM see the redundant VSM and all the VEMs as installed modules?
Adding a new VLAN for VMware Servers As Example VLAN 121 VOICE-SERVER-VLAN
Create Vlan on Nexus1000V
Add a Port profile for vethernet
port-profile type vethernet 121_IPTEL
switchport mode access
switchport access vlan 121
Add a port profile ethernet for uplink which is having the original server.
port-profile type ethernet VM-Data-10G
switchport mode trunk
switchport trunk allowed vlan 2,121
channel-group auto mode on mac-pinning
Add VLAN on Cisco UCS
Allow VLAN on ther Server NIC