We suggest for you to use the PowerPoint application under the Microsoft Office installed on your computer instead of the PowerPoint online. Just to set your expectation, it only has a limited sources once you use the application online.

Let me get this straight:

After going through your support chat, which is linked to from Powerpoint Online, I am told that support chat does not support the Powerpoint Online product, and redirected here, to MSFT community.

Here, when I state my problem, rather than acknowledging it as a bug and offering to report/escalate, you have simply told me NOT to use the problem product?

How is it Microsoft, a billion dollar software company, has deployed a web product to production that they do not support?

My expectation of features being included is low. But my expectation that those features which have been included work properly is very high.

My son was instructed by his teacher to use Powerpoint Online. He does not have MSFT Office on his school issued Chromebook.

Your suggestion is bizarrely unhelpful.