No, I do not use Cloudflare, but I encounter such an error.
Data validation failed and the CA was unable to get the correct captcha from the authenticated connection.
Verify domain name:ufuk.site
Verify URL:Click to view
Verify content:VC1KD-seaDzxaJTQhubwBmTnP397tQA99iSvQO_e0Nw
Error code:80.219.24.122: Fetching http://ufuk.site/.well-known/acme-challenge/VC1KD-seaDzxaJTQhubwBmTnP397tQA99iSvQO_e0Nw
: Error getting validation data
Verify results: Verify failed