XF 2.3 Bounce email setup - Oops! We ran into some problems

I keep getting this message, and can't seem to figure it out. I have created a bounce@mydomain.com email and added and saved it to the bounce email address. Then I got to Setup>Options>Email options>Automated bounced email handler and clicked on Enable. It brings up some selections, and I have tried both IMAP and POP3, but when I punch in my info, this is the message I get. When I close out of the window, I have no server error messages either. I have tried this using either the Xenforo PHP sending method or the SMTP sending method for the mail delivery system, and both produce the same results. I have checked my credentials and have even deleted/recreated the mailbox. I have tried both on my home computer and office computer with the same results. Any ideas?




Looking at the console, it says: /admin.php?options/emailBounceHandler/email-handler-server:1 Failed to load resource: the server responded with a status of 403