M370 no video with supported format and MIME type found

I have two identical installations of the M370. On one I did not get this error when I try to view an MP4 video on a website. It happens on one installation but not the other. It happens no matter if I use Edge or Firefox, I have deleted all cookies for both browsers, updated both browsers but nothing has solved the problem.

On the affected system if I download the file from the website the MP4 file will play. All other MP4 files work just fine. What am I missing?


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