When you land on prod-membership-integration-wus.cld.samsclub.com, you are greeted with the default Apache2 Ubuntu welcome page. That is not a real website — it is the placeholder page that appears after installing the web server software. There is no actual content, no login form, no pricing, and no indication of what service is being offered.
The most telling red flag is the complete lack of HTTPS encryption. Any modern website that expects you to share data or create an account must protect that connection. This one does not. Combined with hidden ownership info, no privacy policy, and no record of ever existing before today, the evidence points to a server that has either been abandoned or is not ready for public use.
If you came here expecting a Sam's Club membership page, this is not the right place. The domain name uses Sam's Club's brand but shows none of their actual services. Until this site gets real content, legal pages, and encryption, there is no reason to interact with it at all. Treat it as a parked or misconfigured domain and avoid entering any information.