I added myself to the server document and tested, but nothing happened.
Then after about 20 minutes I added "Procurement/COMPANY" to the ACL with manager permissions. Now the messages are being processed. I don't know what to make of it. I have never added the mail in database account to the database's ACL before. So I do not know if that is the solution or it just took time for the changes to the server document to kick in. I'll investigate tomorrow.