Hi Robert,
The Name Server records should be as below:
Name server 1 ns1.bdm.microsoftonline.com
Name server 2 ns2.bdm.microsoftonline.com
Moreover, if the domain still cannot work normally, you can use the Domain Troubleshoot tool in Portal to get the exact settings information to set the Name Server records:
1. Navigate to Office 365 Portal (portal.microsoftonline.com), click Domain at the left panel
2. Select the custom domain you have verified, click Troubleshoot
Thanks,
Nancy Xie