Make sure that the fields "Agent Domain E-mail Address" and "User" in the IMAP settings have the same exact e-mail address.
These fields can be found under Maintenance | Stat Central Agent | Email Settings
A new window will show up and click on the first drop down menu (Service Domain), select the correct service domain.
Then you will see both fields, they must have the same exact e-mail address.
If your Agent Domain E-mail Address have two inboxes, make sure to ask your E-mail administrator to redirect the e-mail messages to the inbox of the User listed in the IMAP Settings.
Then click on Apply, restart the Stat client and try to approve the e-mail again.
