Gotcha, I understand now. The pages are protected so I assume you can’t unlock them. If privacy is critical, I would contact support directly and show them your domain setup with these pages. You can unlock the pages for them, I’m sure they’ll help you figure it out. Although -
Off the top of my head without troubleshooting ability, I would say it’s going to be somewhere in the “Player Admin”. Which service is delivering these players and where are the files stored? Whenever this happens, it’s usually the “Type” of embed chosen. Some JS embeds don’t work properly, and some HTML embeds have issues as well. Oftentimes testing the embed type and code is the direction to start.
The domain is not really going to be the problem, the player and content is not stored there anyway. However, applications handle players differently. E.g., Shopify will not show some HTML widgets, but they show other JS embeds.
That’s where I would look first. While in your player admin, ask support which embed option works best.