Hi Raymond,
The problem seems to stem from the fact that on some Especially Windows 10 machines the latest Adobe Reader updates do not like to open any pdf files not created on adobe. I’m not sure there is anything you can do on your end.
You could install Master PDF and try that as it has very good compatibility with Adobe.
you can find it here download the .deb file. https://code-industry.net/get-masterpdfeditor/
also this article may explain some of the problem. https://www.auslogics.com/en/articles/what-if-pdf-files-wont-open-in-windows-10/
Good luck.