Embedded YouTube videos not displaying in LMS

While checking our Studio '13-based content, published for the LMS, that was uploaded to Canvas, none of the YouTube videos that I embedded as web objects on slides are displaying. (See the attachment.)

The problem is present in SCORM Cloud too and when viewing in the latest versions of Firefox and Chrome.

The videos display fine when viewing the published content on my local machine. But once uploaded to an LMS, they don't for some reason.

Articulate Studio '13
PowerPoint 2016
Packaged as SCORM 2004, 3rd Edition
Windows 10 Enterprise

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