I am attempting to implement a calendar approval workflow and two of the approvers seem to be having issues accessing the task to approve the item. Right now I have an email that is sent to the approver with a link to the task FormURN. When they click on the link in the email however they get

An unexpected error has occurred.

enter image description herewith a correlation ID and that's it. They also get the same error if they try to hit the direct URL to the task as well.

I have confirmed that these two approvers have designer access to both the calendar and the task list involved. Everyone else seems to be having no issues. I have also ruled out that it's a location issue as other users in the same location have no issue. The correlation ID is not showing up in the workflow history and I am not seeing any errors in the workflow history reports.

I currently have it so it sets a variable called Approvers based on the Department chosen:

Set Variable: Approvers to <domain>\<userID>

It then starts an out of the box approval workflow which has been heavily customized using the variable:

Start Time Off Approval process on Current Item with Variable: Approvers

I am using SharePoint 2010 Designer for the workflow. I am also able to hit the form without issue by clicking on the email link as well.

As I only have designer access I have requested a ticket to be opened to look up the correlation ID on SharePoint Foundation but no response yet from the team that manages that server.

Any suggestions would be greatly appreciated.

  • For future problems, download the uls viewer where you have a realtime logging and the possibility to filter by correlationId
    – Emaborsa
    Commented Mar 5, 2020 at 18:58

1 Answer 1


Looks like this was due to a task permissions issue after all. After I unchecked "Only allow task recipients and process owners to read and edit workflow tasks" it no longer had an issue. Thanks.

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