Hyper V 2016 - Failover clustering - VMs not powering on

Hi,

I have two 2016 Hyper V servers configured in a failover cluster, Validation report is good, VMs live migrate between both nodes, file share witness configured, 

When we power off one host the VMs migrate to the other host however they never power on

If we manually power on they succeed. Can't figure out if this is a settings or misconfig 

Thanks

Rob