read your output. Or the checks of your domain, 20 or 10 minutes old - https://check-your-website.server-daten.de/?q=clandevelo.com
| Host | T | IP-Address | is auth. | ∑ Queries | ∑ Timeout |
|---|---|---|---|---|---|
| clandevelo.com | Name Error | yes | 1 | 0 | |
| www.clandevelo.com | Name Error | yes | 1 | 0 |
There is no A- or AAAA-record. So you can't use http validation to validate your domain.
Start with
Then check
PS: Are you the domain owner? If not, you can't create a certificate.