Some site administrators have been unable to use Visio web access webparts after configuring Visio Graphics service application in central administrator. After adding the Visio web access webpart in a page, an error was displayed that says, "Visio Web Access is not available on this site".
The solution for it is the activation of the feature ""SharePoint Server Enterprise Site Collection features" at site collection level and also the activation of the feature "SharePoint Server Enterprise Site features" at site level.
Ed Price - MSFT edited Revision 3. Comment: Updated title per guidelines
Ed Price - MSFT edited Original. Comment: Updating to make this a Wiki article.