This check determines whether web applications in SharePoint 2010 are utilizing claims-based authentication.
Claims-based authentication is an essential component in SharePoint 2013. Although you can migrate a non-claims web application to SharePoint 2013, many underlying components will not function properly. If you are planning an upgrade, we recommended that you upgrade your existing non-claims SharePoint 2010 application to a claims-based application prior to your upgrade. We also recommend that you perform a couple of test runs before you complete the production upgrade.
Converting from classic authentication to claims-based authentication can be achieved using the following Powershell cmdlet:
Please consult Migrate from classic-mode to claims-based authentication in SharePoint 2013 for instructions.
Additional information can be found in the following articles: