.de requires two name server, each with different ip's

[eXTric]

See here

Secondary DNS and second domain

You have to have the second domain on the MiaB before you do this step. So add an email account for the second domain, and try again with Puck. What is happening is that Puck is asking your MiaB for the records for the domain, and the MiaB is responding “I don’t have that domain to share with you.”