Sunday, September 29, 2019

Be aware: join as MS Teams Live Events guest requires that one is pre-authenticated against the inviting tenant

With MS Teams Live Events produced via Teams (aka QuickStart) it is already supported to invite externals (MS Teams produced via External App will support it once the underlying Microsoft Stream Live Events capability supports guest access). Guest access in MS Teams Live Events by Teams is realized by utilizing the Azure AD B2B capability, similar as is done in the external sharing of a MS Teams instance itself with external guests, and also in external sharing SharePoint Online sites. Interesting is that the external does not need to be invited to any MS Teams instance of the inviting company. This makes sense, as a MS Teams Live Events instance itself is not tied to a particular MS Teams instance; it is scheduled from the MS Teams Calendar.
Guests can join the Live Event via the browser or via the MS Teams App. In case of the latter: In your joiner instruction to invited guests, please make sure to inform them that they first must authenticate themselves against your (the inviting) tenant, before trying to join the MS Teams Live Event via the distributed 'attendee link'.
No permission to join as guest in case not authenticated before
Authenticate as Azure AD guest to the MS Teams of the inviting tenant; first authentication is 'federated' against the invited guest identity administration, and next most likely second / multi-factor authentication against the inviting tenant
Once authenticated as AAD guest to the inviting MS Teams tenant, allowed to join the invited Live Events direct via the 'attendee link'

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