The default edge-ip-version should be auto which should auto detect, but clearly it's not as your lo
The default edge-ip-version should be auto which should auto detect, but clearly it's not as your log there shows its trying IPv4 addresses lol
sudo nano /etc/systemd/system/cloudflared.service if configured as a service/using remote tunnels)ExecStart=/usr/bin/cloudflared --no-autoupdate tunnel run --token ExecStart=/usr/bin/cloudflared --no-autoupdate tunnel --edge-ip-version 6 run --token sudo systemctl daemon-reload && sudo systemctl restart cloudflared

_acme-challenge.gluee.shop.gluee.shop_acme-challenge as the Host for the CNAME. Otherwise it's taking it to be _acme-challenge.gluee.shop as the subdomain, which puts it under _acme-challenge.gluee.shop.gluee.shop which not what it wantssudo nano /etc/systemd/system/cloudflared.serviceExecStart=/usr/bin/cloudflared --no-autoupdate tunnel run --token ExecStart=/usr/bin/cloudflared --no-autoupdate tunnel --edge-ip-version 6 run --token sudo systemctl daemon-reload && sudo systemctl restart cloudflared_acme-challenge.gluee.shop.gluee.shop_acme-challenge_acme-challenge.gluee.shop _acme-challenge.gluee.shop.gluee.shop