Did you try using the dc name and the IP? For example \\dc1.ad.domain.tld and \\192.168.0.10
Does the Windows client use the NS8 as DNS server?
If you already tried a lot of logins please reboot the Windows PC as there could be issues when logged in on another share with another name etc.
Windows has a credential manager, maybe there are saved old credentials that are not working anymore.
EDIT:
To get the samba-dc hostname:
runagent -m samba1 podman exec samba-dc hostname