See these questions/answers for Microsoft Stream.
Microsoft Stream is a secure video service (part of your ECU Microsoft 365 subscription) that works as an ECU-only, online video repository or within Teams, SharePoint and Office apps like PowerPoint and Word.
Host an interactive, online presentation for up to 1000 participants or give a speech to 10,000 users through the view-only experience.
Cisco Event is replacing the Training Center with easier-to-use scheduling and all the same options.