You are violating the policy. You need a minimum of 3 fault domains to use the default policy, each host is implicitly a fault domain.
Having only 2 Fault domains negates the advantages of using vSAN, and you should only proceed if this is a lab environment.
You can either change the policy to FTT=0 or even better, set "force Provisioning" on the default policy. Force provisioning will allow you to create the VM and the folder with the fault domain deficit / violation. If you add a host later on, the objects will be created to reach policy compliance of FTT=1.