All report's actions are supported when viewing the report in HTML5 Report Viewer. An example of NavigateToReport Action working as expected in HTML5 Report Viewer can be found in Telerik Reporting installation folders:
[installation folder]\Telerik\Reporting [version]\Examples\CSharp\ReportLibrary\ReportCatalog
[installation folder]\Telerik\Reporting [version]\Examples\CSharp\Html5Demo
- project with the viewer
If the issue persists you can attach a sample project reproducing it in a support ticket so we can review it locally.
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