I added Telerik Reporting R3 2021 SP2 in my Blazor project using .NET 6 and I got this error:
The reference "Telerik.Reporting, Version=188.8.131.525, Culture=neutral,... " could not be added to the project...
Are you trying to add a reference to the Telerik.Reporting.dll from the Bin folder located inside the install directory of Telerik Reporting?
If that is the case, this assembly is built to be used by .NET Framework applications. For your case, please instead get the Telerik.Reporting NuGet package from the NuGet Package Manager. If you have not yet set up a Telerik feed, you may do so by following the How to add the Telerik private NuGet feed to Visual Studio article.