Mail filters treat brand-new domains with suspicion, and they are right to — throwaway spam domains are days old. If you send a thousand cold emails from a domain registered last Tuesday, you will not get far.
The domain list and detail page now show a domain age badge based on the real registration date from WHOIS/RDAP, not on when you added it to Sellvance.
It answers the question that decides your launch date: is this domain old enough to send from yet, or does it need more warming first.