DNS entry for subdomain with other nameservers

Hello all,

I'm trying to add a subdomain with exteal nameservers.

For example:

Domain hosted at my machine: abc.nl
Subdomain created on my machine: nl.abc.nl with as example ns1.xyz.com and ns2.xyz.com.

This is not working.

When I'm creating test.abc.com with as example ns1.xyz.com and ns2.xyz.com, this is just working perfect.

Is someone recognizing this issue?

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