You're using blade servers ? If yes, you may not be able to configure LACP in your vSphere ESXi since each host physical interface connect to a different switch module on chassis and the requirements to use LACP is that all physical interface that will me part of LACP must be connected to the same physical switch (or different switchs but in stacked configuration).
Take a look: VMware KB: Host requirements for link aggregation for ESXi and ESX
The switch must be set to perform 802.3ad link aggregation in static mode ON and the virtual switch must have its load balancing method set to Route based on IP hash. Ensure that the participating NICs are connected to the ports configured on the same physical switch.