Argo Tunnel/cloudflared issues

I’ve been wrestling with getting Argo Tunnel set up. I try the following:

  1. I first run:
docker run -v ~/.cloudflared:/home/nonroot/.cloudflared cloudflare/cloudflared:2021.8.2 login
Please open the following URL and log in with your Cloudflare account:

<callback URL>

Leave cloudflared running to download the cert automatically.
You have successfully logged in.
If you wish to copy your credentials to a server, they have been saved to:
  1. I then run:
docker run -v ~/.cloudflared:/home/nonroot/.cloudflared cloudflare/cloudflared:2021.8.2 tunnel --no-autoupdate --hostname --url local_other_machine

Things look like they are working, but when I visit, I am initially prompted with an email to receive the pin, enter in the pin, and then I get a “too many redirects”. How do I work around this?

Thanks in advance!