Not possible to embed a youtube video

Hello,

I have tried several times but it's not possible.
I have used the Widget Connector Macro and have used a normal youtube url.
The preview shows the correct video but if I save it, it's not on the page and it invisible. We are using https and I have already tried the documented workaround for https but it doesn't solve my problem.

Please help me.
Kind Regards
Elke