How to make support the HTML tag “oembed” by the wordpress editor

I want to add the following html code to my wordpress editor but the youtube video is not embeded. The url disappear.

TinyMCE paste plugin on IE 11 on paste, pasting %%MCEPASTEBIN%% instead of the actual text and getting stack overflown

I am using tinyMCE v5.5.1 with paste plugin v5.6.2. On pasting anything in the tinyMCE editor in IE11, it gets stack overflown and pastes %%MCEPASTEBIN%% until the browser stops responding. It works …