technet.ovh has an AAAA (IPv6) record (2001:41d0:305:2100::4a79) but a test request to this address over port 80 did not succeed. Let's Encrypt will prefer to use AAAA records, if present, and will not fall back to IPv4 records. You should either ensure that validation requests to this domain succeed over IPv6, or remove its AAAA record.
A timeout was experienced while communicating with technet.ovh/2001:41d0:305:2100::4a79: Get http://technet.ovh/.well-known/acme-challenge/letsdebug-test: context deadline exceeded
Trace:
@0ms: Making a request to http://technet.ovh/.well-known/acme-challenge/letsdebug-test (using initial IP 2001:41d0:305:2100::4a79)
@0ms: Dialing 2001:41d0:305:2100::4a79
@10000ms: Experienced error: context deadline exceeded