Stop stripping out script tags from posts / pages

The forum is always my last resort for help but I can’t seem to figure this one out.

If I want to post a script tag (as in `<script src=”https://someotherurl.com”></script>&#8217;) I just flip to HTML drop it in and whammo! It works like a charm.

But if one of my MS users tries to do the exact same thing, the code is stripped out as soon as you hit update. I this know because I didn’t believe them when they said it didn’t work I gave detailed instructions. When that didn’t work, I logged in as the user and true to their report, the code is stripped out.

I checked and un-checked visual editor. Makes no difference. I created a new user to see if there was something freaky with that account. Nope.

So, I’m dead in the water and relying upon the kindness of strangers.

HELP!