Prel 2020 - can't open mp4 files from premiere in OneDrive

Strange behavior.  I'm unable to play mp4 files exported from premiere elements 2020 in my Microsoft OneDrive app on my phone and my tablet.  Other mp4 files that came directly from my phone or another person's phone/camera play no problem in the OneDrive mobile app.  But mp4 files from premiere only display a thumbnail of the video with no play button. 

I took an mp4 file directly from my phone and uploaded it to OneDrive.  When I view it in the OneDrive app on my phone, there is a play button and the video plays no problem.  I pulled that same file into premiere, chopped off a few seconds from the beginning, exported it as mp4 same resolution.  Put that file on OneDrive and when I pull it up in the mobile app on phone or tablet, it only shows a thumbnail and no play button. This happens with other projects exported from premiere.  Any idea what could be going on?  I hit a lot of dead ends with Microsoft support.  Any help would be appreciated.  Thanks!