Enable SSH on all hosts and set the policy to automatic

(in a non production lab obviously)

First , have a look at the current state of the SSH service on all of the hosts

Get-VMHost | Get-VMHostService | Where {$_.label -like "SSH"} | select VMhost , running , policy , Label

Then start the SSH service on each of your hosts 

Get-VMHost | Get-VMHostService | Where {$_.label -like "SSH"} | Start-VMHostService

Then ensure that it starts up each time on startup

Get-VMHost | Get-VMHostService | Where {$_.label -like "SSH"} | Set-VMHostService -Policy Automatic