You clicked on a link for 'Rukcar Benefit Solutions' and ended up at a generic Microsoft login page. That is the whole site. There is no company information, no benefits portal, nothing except a redirect to Microsoft's authentication screen. For a legitimate benefits service, that is not how things normally work.
A real employer benefits portal would let you see the company name, provide a way to contact support, and show some of its own branding before asking you to log in. Here, all of that is missing. The domain has no history on the Wayback Machine, no independent reviews, and no public WHOIS records. You cannot find out who operates this site.
Because your credentials would go to Microsoft's servers but the organization that invited you remains invisible, you have no way to confirm this is your actual benefits provider. If you received a link to this page from an email or text, contact your HR department directly through a known phone number or company portal before entering anything. The safest move is to assume this is a phishing attempt until you verify otherwise.