Works fine locally. Issue happens in docker container running on Alpine Linux. 
GroupDocs.Conversion: v22.12 
.NET version: .NET 7.0 
Error Message: 
GroupDocs.Conversion.Exceptions.GroupDocsConversionException: Object r…...Conversion from RTF/DOCX to PDF exception inside Docker on Alpine...MSG file with attachment to pdf. rtf, docx, pptx, xlsx works...