Here's what stands out about us.hydrogen.sagittarius.connect.product.adaptavist.com: there's almost nothing to find. No about page, no company name, no social media presence, and the domain itself isn't even registered in WHOIS. For a site that presents itself as a product or service platform, that level of anonymity is a major concern. Legitimate SaaS companies typically have clear branding, an identifiable legal entity, and some digital footprint you can trace. This site has none of those things.
The technical setup is fine — it uses Amazon's cloud with a valid certificate — but that's like noting a car has good tires while the registration and VIN are missing. The robots.txt file blocks all search engine crawlers, which is a strange choice for a real business. There's also no history in the Wayback Machine, so this domain appears to be brand new or was never publicly indexed. If you're considering using this service, you're flying blind. Until someone steps forward to claim responsibility for this site, there's no reason to trust it with anything personal.