Mixed Content Errors on Episode Playback

We recently added an SSL cert to our website, and we’re seeing some mixed content console errors on podcast pages during playback related to a request for “an insecure video”. Pages show as secure without issue until audio begins to play. Trying to narrow down the cause, if the request for insecure assets is coming from the plugin code or if you might have suggestions for how best to address this issue.

The page I need help with: [log in to see the link]