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from your screenshot, i can understand that you are trying to migrate the management vmkernel adaptor along with physical vmnic0 (standby pls check why it is in standby mode)and you have not migrated your VMs to distributed switch. as the vSwitch0 is configured with only one uplink if you try to migrate only vmkernel along with the uplink, then the VMs will loose the connectivity. that is the reason you are not able to migrate.
I would recommend you to migrate vmnic0, management vmkernel and VMs in a single shot.
Clear ! problem was solved.