Error 1033 Argo Tunnel Error

I tried to delete a cloudflared tunnel using the Zero Trust portal (Access->Tunnels) as I no longer have the configuration and keys used to setup the tunnel.

The tunnel was listed and I selected to delete it. That was last week. When I did this, the page stopped working and instead displayed the “Error 1033 Cloudflare Tunnel Error” page. That error hasn’t gone away.

I have no way to delete this using cloudflared, is there some other way to completely remove the tunnel so that the page gets loaded across the internet?

Thanks,
Richard