The number of vSphere HA heartbeat datastores for this host is 1 or 0, which is less than required: 2

When building the lab environment you may only want to have the 1 Datastore setup.  If so you may encounter the above Warning

Select your Cluster, click Configure, vSphere Availability and click Edit

Select Advanced Options

Select Add

Add the option:

das.ignoreInsufficientHbDatastore = true

And Save