A delegate has completed an expense report on your behalf. You received an email with a link to approve the report but when you click on the link, you receive an error that you don't have access.
Solution
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You will need to wait until the following day to approve the expense report.
The expense report was submitted on the same day as you assigned the delegate.
It takes overnight for the approval access to be automatically applied to your account after a delegate submits your first expense report.