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Convert to image does not convert charts when running under IIS

We have a ASP.NET Core 3.1 web API which among other things converts pptx files to images. Embedded charts (i.e. data-driven charts backed by embedded Excel data) are rendered when the API is run from Visual Studio (under IIS Express), but not when hosted on IIS proper. No errors are thrown or logged, there is simply a blank space in the output where the chart ought to be.


This feels like it might be some sort of permissions problem (IIS Express runs as the developer's account, while under IIS, we are using ApplicationPoolIdentity for the API), but it's not obvious to me what needs to change in the setup to make this work, and I can't find anything in your documentation about it.


We are using the WPF packages because we also need support for some features in DocIO that aren't available in the .NET Core packages (e.g. Table of Contents). 


Any help is appreciated.


Regards,


John