Video Not Playing in Explorer

I know folks have said they are having issues having videos play in Chrome. I actually have the issue of Explorer not playing all my videos, especially in Rise. 

If I publish it for the LMS, it seems ok, but I don't want my reviewers to be concern about not seeing a video (or not able to see them).

Is this a known issue for Explorer?

It's not all the videos (which is weird because they are the same file format and small).

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