Cannot open mp4 videos - XFinity

Using the Xfinity Connect app, mp4 files display a black screen when opening them from email. I am using an iPad Air2. My wife can view the files on her iPad Air2. She is not using Xfinity Connect. This is a recent, over the past week, issue.

This question, "Cannot open mp4 videos," is about XFinity-Comcast TV Television Apps.

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