Command line syntax to initiate a SQL failover in Windows 2012

That should have worked, was the command runas as an administrator?
Also so this link:
https://www.mssqltips.com/sqlservertip/2713/sql-server-clustering-management-inside-the-command-line/

That's what I thought--yes, I'm running as administrator. It's returning 'cluster' is not recognized as an internal or external command, operable program or batch file.

There are several ways to do that (all of them must be done using one of Nodes of Failover cluster)

• Open the Failover Cluster Manager, connect to Windows Cluster, right click on the SQL Cluster Name (under 'Services and applications') and then choose 'Move this service or application node to another node')

• Using the command prompt as you described. The error you faced seems to suggest that you are not running the command from one of the nodes and that machine doesn't have failover clustering feature installed.

• Restart the active node (this method is least preferred); resources will be shifted to other node automatically.

Also please confirm that you tried using the command prompt or Powershell?

There isn't a cluster.exe anywhere. The only solution is to use PowerShell.

Strange.

Powershell works as well.

Ensure to run Powershell as admin.