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    Error "Retrying last request ... Details of last request: HTTP Unauthorized" Starting Workflow

    Status: Validated

    When starting, workflows might appear to be stuck and the following error message might occur:  

     Retrying last request. Next attempt scheduled after MM/DD/YYYY TT:TT. Details of last request: HTTP Unauthorized to {SiteURL}/_api/sp.utilities.utility.SendEmail
    Details of last request: HTTP Unauthorized to {SiteURL}/_api/sp.utilities.utility.SendEmail
    1. In the site from which the workflow is running, open the Site Settings.
    2. Under Users and Permissions, navigate to People and groups.
    3. From the groups on the left-hand side of the window, select the SharePoint group where the email is being sent.
    4. Select Settings at the top of the group list, and then select Group Settings from the drop-down menu.
    5. Change Who can view the membership of the group? from Group Members to Everyone.
    6. Click OK.
    7. Run the workflow again.
    The workflows are suspending because the user account starting the workflow is not a member of the SharePoint group the Send Email action is trying to resolve, and the Workflow Manager system then suspends the workflow.