...

• Domain-only (DV) which is always available as soon as the domain is validation and only includes domain information. This is the same type of certificate you get from Let's Encrypt.
• For enterprises or organizations (OV), which is available after Organization Validation. This is the same type of certificate you got from Sectigo.
• Do not select "For enterprises or organizations (EV)" as this is not included in the contract.

If the DV or OV option is shown as "from AMOUNT€ year" instead of "free", you have probably made a typo and entered a name for the certificate that is under a domain that does not belong to your Enterprise. Start over and make sure the names are right.

Confirm the choice of type and then confirm the information and accept the terms of use etc.

...