NIS support was deprecated in RHEL 8 and completely removed in RHEL 9.
However we still advise to use "@printadmin"
https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/9/html/configuring_and_using_network_file_services/assembly_using-samba-as-a-server_configuring-and-using-network-file-services#proc_enabling-users-to-upload-and-preconfigure-drivers_assembly_setting-up-automatic-printer-driver-downloads-for-windows-clients-on-samba-print-servers

1.16.3. Setting up the print$ share

  write list = @printadmin
force group = @printadmin

 A name starting with a '@' is interpreted as an NIS netgroup first (if your system supports NIS), and then as a UNIX group if the name was not found in the NIS netgroup database.

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Solution:

We should remove the @