1) Recreate the PDF using fonts which do not become encoded using Identity-H. This should result in the PDF opening with the expected appearance of all fonts.
2) If the PDF file is saved to a customer managed storage, then it is likely that there is also a customer managed Office Online Server. This Office Online Server is used to render the PDF file, so it is possible to install commercially available fonts on to it.
3) A different option can be used to repair the PDF file at the point of creation. If there are fonts inside using Identity-H encoding, then these fonts can be converted to a raster for compatibility purposes. Look for the ‘text to curves’ option (or similar) in your PDF creation software and use this before publishing the final document.