We recommend that you first change the host side to LACP via the cluster vswitch. This will do a “rolling reboot” task which puts a host into Maintenance mode and makes the change to active / active with LACP and fallback enabled. Since the switch side is not setup we’ll fall back to active / backup.

Once host are done you then need to put a host into MM and make the switch configuration changes. Ensure this is working and then move to the next host.

You can find this below. 

https://portal.nutanix.com/page/documents/details?targetId=AHV-Admin-Guide-v6_8:wc-enable-lag-and-lacp-on-tor-switch-t.html

To verify LACP manually you can look at KB-3263 https://portal.nutanix.com/kb/000003263

Thanks a lot for your reply.