The domain geekpi.be is being served through Cloudflare CDN. Any Let's Encrypt certificate installed on the origin server will only encrypt traffic between the server and Cloudflare. It is strongly recommended that the SSL option 'Full SSL (strict)' be enabled.
https://support.cloudflare.com/hc/en-us/articles/200170416-What-do-the-SSL-options-mean-
Challenge update failures for geekpi.be in order https://acme-staging-v02.api.letsencrypt.org/acme/order/5751349/45280
acme: error code 400 "urn:ietf:params:acme:error:dns": DNS problem: NXDOMAIN looking up TXT for _acme-challenge.geekpi.be - check that a DNS record exists for this domain
The IANA public suffix is the TLD of the Registered Domain
The TLD for geekpi.be is: be
1 Certificates contributing to rate limits for this domain
Serial: 363197152683067016570743336663823971299276
NotBefore: 2021-02-27 17:09:44 +0000 UTC
Names: [*.geekpi.be]
The current status.io status for Let's Encrypt
Operational