Let's Debug

Test result for kai.kaidesign.uk using http-01

A private, inaccessible, IANA/IETF-reserved IP address was found for kai.kaidesign.uk. Let's Encrypt will always fail HTTP validation for any domain that is pointing to an address that is not routable on the internet. You should either remove this address and replace it with a public one or use the DNS validation method instead.
A and AAAA records found for this domain
kai.kaidesign.uk. 0 IN A
The IANA public suffix is the TLD of the Registered Domain
The TLD for kai.kaidesign.uk is: uk
The current status.io status for Let's Encrypt

Submitted May 3 14:26:40 2023. Sat in queue for 4ms. Completed in 2s. Hide verbose information.