How to connect argo tunnel to the WordPress website

getting close 502 = your nginx origin server and/or php-fpm is unavailable/down or not workinging. So problem is not on Nginx origin server side. Cloudflare Tunnel looks good though you don’t need warp-routing enabled from my experience outlined at https://blog.centminmod.com/2021/02/09/2250/how-to-setup-cloudflare-argo-tunnel-on-centos-7/.