The most likely cause for this issue is that the DNS server and DHCP server can be seen or found in different domains.
A DHCP Server is known to be a kind of a network server that is said to function by automatically giving and placing IP addresses, default gateways and other kinds of parameters of a network to the computers of their client devices.
Note that when the DNS server and DHCP server can be seen or found in different domains, the issue of updating automatically can arise.
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