Start by refreshing the page, checking your connection, and trying the video in a private window. This rules out stale sessions and cached assets.
If playback still fails, disable aggressive browser extensions, especially blockers that can interfere with embedded media or third-party video hosts.
For persistent issues, switch browsers or devices and send support the affected course, time of failure, browser version, and any visible error message.
Need more help?
Visit the broader Help Center for additional troubleshooting guides and support workflows.