It makes no sense whatsoever for a Microsoft agent not to have the ability to initiate a ticket or request that Microsoft fix a verified, universal malfunction in one of its Office 365 apps.
What is the point of this official Microsoft community help forum, then? And why wouldn't Microsoft want to resolve/fix this malfunction as soon as possible for all its customers? This is not an individual issue: it is a universal bug.
Someone in management needs to reassess and improve customer service.
And, BTW, I tried the embed workaround before I posted my original comment. It doesn't work either. You should have tried that too before suggesting it.
Something is preventing YouTube videos from being embedded or inserted into Sways whereas it worked easily for years. What changed?