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Why should there always be a matching Administrator account in Workspace 365 and Office 365?

Changes in details and/or permissions of users in the Workspace have to be communicated with the underlying Office 365 environment. To make this possible, the presence of a corresponding Administrator account in both Workspace 365 and Office 365 is required. In Office 365, this has to be a Global Administrator (role). Some examples of changes that require these, are: 

  1. Modifying user passwords
  2. Customizing user permissions (documents, libraries or team sites)
  3. Changing profile information