Can't Migrate from cPanel and Exim

Can't Migrate from cPanel and Exim

I am attempting to migrate my email from a cPanel server (running Exim). I am in the admin panel, I have the migration event created and am attempting to add a user. After filling out the server details for IMAP, I attempt to add a user. Zoho processes the request but it fails, saying it can't connect to the server. The server's firewall is not blocking Zoho.

Here is the Exim log entry.

Jan 30 18:00:30 host dovecot: imap-login: Disconnected (no auth attempts in 0 secs): user=<>, rip=74.201.84.158, lip=xx.xx.xx.xx, TLS handshaking: Disconnected, session=<xxx>

As far as I can tell, the Zoho app is not sending the username with its login attempt which is causing the migration tool's add user function to be rejected and not connected. Clearly the connection is making it to the server, but it isn't sending the proper information for a login attempt.

Is there something I am missing? Is this a bug on Zoho's side?