I don't know exactly on which version when this functionality stop working but Telerik Report Viewer (HTML5) doesn't longer call /formats endpoint to get available formats on viewer initialization.
One workaround (or so) that we have found was to enable send email option to true (sendEmail: { enabled: true }) but this breaks our app as no email sending is required by our app users.
This is directly reproducible with build in CSharp.NetFramework.Html5IntegrationDemo and Telerik Report version 20.0.26.211 by changing
sendEmail: { enabled: true } on html js code.
Please advise.
