Two support articles to understand what is a DCV:

The Comodo DCV process is explained here: https://help.comodo.com/topic-437-1-843-10844-.html

Else another article:

https://www.namecheap.com/support/knowledgebase/article.aspx/9637/68/how-can-i-complete-the-domain-control-validation-dcv-for-my-ssl-certificate

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