Beware: Request SharePoint Root Certificate as administrator

On trying the Microsoft advised workaround 1 in situation in which in the SharePoint 2016 central admin server every hour a 'Critical Error' is logged on 'A certificate validation operation took milliseconds and has exceeded the execution time threshold', I initial failed as Get-SPCertificateAuthority returned Null for RootCertificate. The trick / requirement here is to invoke the cmdlet from PowerShell runas administrator:

MS Teams capabilities and external access

MS Teams as collaboration hub exhibits in its total set of capabilities differences wrt external access; some minor, some significant. Overview of my current understanding:

Teams capability	External access options
Chat and Calls	Teams Federation Teams Guest Access
Meeting	Anyone can be invited on own email Lobby function for controlled entrance in the meeting
Live Event; audience	Teams Federation Teams Guest Access Full anonymous
Live Event; presenter	Teams Guest Access
Teams instance	Teams Guest Access

How-to enable for mobile device the seamless consumption of embedded Microsoft Stream on SharePoint page

SharePoint Online Modern Sites/Pages are by-design prepared for mobile / on-the-go consumption. An use case is to embed a Stream video on a page - either on-demand or live event -, and the audience then has the freedom to consume on regular workplace, or via their own mobile device.

However, be aware that in the latter case for seamless Stream behavior it is required that the mobile browser is set to 'Allow All Cookies / Block No Cookies'. Without this, typical the mobile browser fails from within the authenticated SharePoint Online context, next implicit logon the user to the embedded Stream service. The SharePoint Online Product Group confirmed this: To enable in Edge on mobile device seamless MS Stream behavior when embedded on SharePoint Online [modern] page, then infra prerequisite is that mobile Edge is configured to ‘Not block cookies’. The subject is current missing from the requirements stated on Microsoft official Knowledge Base. The Engineering Team will add this to the documentation for further clarity in the future.