SharePoint 2013 + The Taxonomy feature (Feature ID “73EF14B1-13A9-416b-A9B5-ECECA2B0604C”) has not been activated

If you are getting this error when try to add a custom column of the Managed  Metadata type to your site collection, use the following PowerShell command to activate this feature

Enable-SPFeature -id 73EF14B1-13A9-416b-A9B5-ECECA2B0604C -URL