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vPC-HM does not require a port-channel configuration on the upstream switch nor does mac-pinning. The northbound device sees these interfaces as host ports.vPC-HM did require the upstream switch to support CDP, mac-pinning does not.
Can you try "show system vem feature level"?Make sure the ouput matches the version of the VSM and VEMs. If it is not the same you need to update the VEM feature level to what is currently on the VSM.The command to increase the feature level is "sys...
Beware of duplex issues that can pop-up from time to time on FE connections, hard coding can help avoid that. I would also suggest portfast where applicable ie switchports.