Not just you, archive today has a beef with cloudflare. I wasn’t even using cloudflare intentionally but iirc Firefox has a dns privacy setting that I had to disable.
Since May 2018[35][36] Cloudflare's 1.1.1.1 DNS service would not resolve archive.today's web addresses, making it inaccessible to users of the Cloudflare DNS service. Both organizations claimed the other was responsible for the issue. Cloudflare staff stated that the problem was on archive.today's DNS infrastructure, as its authoritative nameservers return invalid records when Cloudflare's network systems made requests to archive.today. archive.today countered that the issue was due to Cloudflare requests not being compliant with DNS standards, as Cloudflare does not send EDNS Client Subnet information in its DNS requests
Since May 2018[35][36] Cloudflare's 1.1.1.1 DNS service would not resolve archive.today's web addresses, making it inaccessible to users of the Cloudflare DNS service. Both organizations claimed the other was responsible for the issue. Cloudflare staff stated that the problem was on archive.today's DNS infrastructure, as its authoritative nameservers return invalid records when Cloudflare's network systems made requests to archive.today. archive.today countered that the issue was due to Cloudflare requests not being compliant with DNS standards, as Cloudflare does not send EDNS Client Subnet information in its DNS requests
https://en.wikipedia.org/wiki/Archive.today