Syncfusion Licensing error may occur under the below scenario for the File Format assemblies in .NET Standard..
If this is the scenario you are using, we suggest you to use ”Syncfusion.DocIO.Base” NuGet which is available in the below NuGet feed to overcome this issue.
Also, we recommend using the following NuGet packages in your ASP.NET Core application based on your targeting framework.
The below link describes how to refer the packages from the NuGet link.
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