Hello everyone,
Not new to Zentyal, but certainly not the expert many of you are.
One experience I wanted to share was during the installation of a SECOND instance of Zentyal, joining the AD it requested to add the details as per the form. My Admin account on the main Zentyal has a ! in it. I tried to put that character in the secondary server when joining and it refused indicating only specific characters were permitted. I removed the ! and voila, worked.