Can I add another domain later, after the SSL certificate has been issued and activated?

Yes, you can add more SANs to your SSL certificate any time after issuance, provided the existing SSL certificate is listed below:

PositiveSSL Multi-Domain
Multi-Domain SSL
Unified Communications
EV Multi-Domain SSL

In order to add SANs to a certificate, one will need to perform a reissue from within their Namecheap account. It is not possible to upgrade any other SSL certificate type to SAN.

If you need to purchase the additional slots for the domains, please use the option Buy more domains seats shown on the screenshot below.
All additional domains need to be entered in the corresponding fields Add-on domains.

buymoreaddon

You can, however, request cancellation and refund of the existing certificate, purchase the needed SSL certificate, and activate it with the appropriate number of SANs. Comodo (now Sectigo) certificates can be refunded within 15 days after issuance date.

Note: Please keep in mind that the validity period and the price for the additional SAN (Subject Alternative Name, additional domain in the Multi-Domain certificate), ordered after the certificate purchase will not be pro-rated.
This means that:
  • The SAN, added to the Multi-Domain certificate any time after its purchase, will cost the same price as the SAN ordered along with the Multi-Domain certificate during the initial purchase;
  • The SAN will expire together with the certificate it is attached to regardless of the exact date of SAN's purchase.

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