Plesk migration - Dovecot is not installed on the destination server. Fail

Hello.

I want to migrate a subscription from:
Server A. Plesk versión: 12.5.30 update 55# with Postfix and Dovecot mail service active. SO: Debian 8.6
to Server B . Plesk Onyx: 17.0.17 update 9# with Postfix and Dovecot mail service active. SO: Debian 8.6

When I tray to migrate the subscriptions from server A to Server B the migration tool show this error message:
Dovecot is not installed on the destination server.
Please install Dovecot by using Plesk Installer.

But its not...

Plesk migration - Dovecot is not installed on the destination server. Fail