"Parameter Is Not Valid" Exception

I’m evaluating different .NET libraries to convert PPTX to PDF, PNG or SVG. We want to run this as internal service on a docker image on a azure web app later on. Using your library everything works fine when running on docker locally but when I deploy it to azure I get a “Parameter is not valid” Exception.
With the following stack trace:
at Aspose.Slides. .(Presentation , Stream , InterruptionToken )
at Aspose.Slides.Presentation.(Stream , Boolean )
at Aspose.Slides.Presentation.(Stream , Boolean )
at Aspose.Slides.Presentation.(Stream )
What could the problem be? Any ideas?

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