Having issue adding a secondary domain to my network

[Gregaku]

Hi, I'm actually working in my Home lab where I have a server / client environment set up with a server configured as DC and DHCP , my current domain is aku-sys.local, I'm trying to add another domain from a separate DC "informatik-lab.local" on the same switch but I'm getting error messages, in both of my forward lookup zones, I will attach images for you guys to understand clearly, let know what I'm doing wrong in the process, thank you in advance.

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