The certificate is activated for each correctly directed to mybox.com servers. By correct referral we mean both full delegation, where the domain has set DNS servers: ns1.mybox.com and ns2.mybox.com, but also when you do not want to make a full change of domain delegation, directing the A record to the IP address of the server associated with your account.
Remember that if you do not want to change DNS servers, but only point the domain with the A record to the server’s IP address, you should do it for both the main domain address and the subdomain with the www prefix.
It turns on for a maximum of a few minutes. Our systems verify new websites at the appropriate time interval and automatically enable the certificate.