How to disable the pop-up message after Task Sequence with Join Domain step?

Symptoms

I get a pop-up message asking to create a mobile account and would like to disable it.

Cause

You have created a Task Sequence with Join Domain step and have checked the Create mobile accounts at login check box.

Resolution

To disable the pop-up message please add a new Install Software step in the Task Sequence, right after the Join Domain step.

It should be an empty package with the following command line:

    /usr/sbin/dsconfigad -mobileconfirm disable

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How to add a Mac to Organizational unit using Task Sequence