All of a sudden getting this pop-up (something went wrong.  you can try again or skip for now) during imaging process where it was working perfectly previously.

Turns out my MDT account that is used to join to the domain has reached its maximum number of joins, which is by default 10.  Since I was using the same computer name for pretty much my testing this didn’t come up.

Make sure you delegate your MDT account specified in the boot.ini rights to join computers at the domain.

Delegate – non-admin account to add workstations to domain