SharePoint Excel Services failed with an error message: "Sorry, we couldn't find your license to use this feature. If you know who manages the licenses for your organization, tell them you'd like a license to use 'Excel Services'."
Make Sure SharePoint Enterprise Feature is enabled
Excel Services is part of SharePoint Enterprise feature in SharePoint 2013. So, Make sure "SharePoint Server Enterprise Site Collection features" is enabled both at site level and Site collection levels. If activated already, Try Deactivate-Activate again!
Have you upgraded from Standard to Enterprise? Enable Features on Existing sites!
When SharePoint Server license is upgraded from Standard to Enterprise, it applies only to new sites we are going to create. For existing sites, we must use "Enable Features on Existing Sites" feature once, under "Upgrade and Migration" in SharePoint 2013 Central Administration site.
SharePoint 2013 User Licensing is Enabled?
Another cause and solution is: If you have enabled SharePoint User Licensing to restrict Enterprise edition features or Office web apps edit, You have to add mapping to "Enterprise" license and add the user in appropriate AD security group! Refer: SharePoint 2013 User Licensing Enforcement
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