This is closely related to the requirements of the SSL certificate issuer you have chosen (Sectigo or Rapid). The type of DV validation (domain) requires the issuer to certify that you fully manage the domain, and therefore imposes the existence of less standard than contact @ or office @ e-mail addresses.
One of the following addresses must exist and be operational:
admin @
administrator@
hostmaster @
postmaster @
webmaster @
How to create such an e-mail in our cPanel, assuming, of course, that the e-mail is hosted on WEBD.pl, you can find out HERE.
