External Users trying to accept the invitation get an error message “That Didn’t Work”

Note:  This article has been moved to the Global SharePoint Online Support Blog as part of a Global Support Initiative.  It is available here. The Scenario Marcus from Contoso Ltd is collaborating on a project for Fabrikam Inc.  In order to facilitate the collaboration, the Project Manager for Fabrikam, Denise, invites Mark to a SharePoint Online…

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