Tunnel Docker Image creation error

I’m trying to set up a Cloudflare Tunnel on a NAS running TrueNAS Scale, but the Docker command that was generated to do the install isn’t working. The error that I keep getting is:

2023-07-26T22:45:07Z ERR update check failed error=“Get "https:// update. argotunnel. com?arch=amd64&clientVersion=2023.7.3&os=linux": dial tcp: lookup update. argotunnel. com on 1.0.0.1:53: dial udp 1.0.0.1:53: connect: network is unreachable”

This is followed by another attempt I think:

2023-07-26T22:45:07Z ERR edge discovery: error looking up Cloudflare edge IPs: the DNS query failed error=“lookup _v2-origintunneld._tcp. argotunnel. com on 1.0.0.1:53: dial udp 1.0.0.1:53: connect: network is unreachable” event=0

Now I know this looks simple enough, but I can ping 1.1.1.1 and 1.0.0.1, so I know I can get out of my network. I can nslookup and find update. argotunnel. com’s IP, and can ping it. Why can’t Docker find what it needs?