I can’t find the intermediate certificate of Let’s Encrypt Authority X3 signed by Signed by ISRG Root X1 on https://letsencrypt.org/certificates/ . Can someone please tell me where to find it?
Otherwise, is there any way to force the client to get the certificate that signed by Let’s Encrypt Authority X1 ?
Maybe I’m not understanding something. Isn’t it on the page you link, right near the top ( the first two lines below the Intermediate Certificates title) …