Public network on NIC instead of domain network

On a Windows Server 2025 Standard Edition, I have 2 NICs: a 10Gbps NIC and 1Gbps NIC.  Both NICs have a static IP address, but only the faster 10Gbps has a default gateway.   The faster NIC correctly identifies as the domain network but the slower NIC says it is on a public network.  The DNS settings and suffixes are the same for both cards.   I have another Windows 2025 server with the same setup but both NICs identify as the domain network.   Any ideas on how to fix this?  Thanks.