Thanks for clarifying that. This time, I’ve created multiple test notebooks in my OneNote account that contain sections and pages. I’ve tried searching for the phrase online video among notebooks (Ctrl+E) with and without the quotation
marks, please refer to these screenshots:
Searched without quotation marks:

Searched with quotation marks:

I was still able to successfully search for the specific phrase that I’m looking for among the notebooks that I have on my account.
Just to confirm, does this behavior also happen on the other applications you have when searching a phrase?
To notify us and have us get back to you, simply reply to this post.