Argo Tunnel nested subdomain

I want to use a nested subdomain like sub.domain.example.com for my Argo Tunnel. Trying this, cloudflared gives me the following error:

“You asked for a tunnel to sub.domain.example.com, but your certificate is valid only for [*.example.com example.com]”

Starting a tunnel with cloudflared tunnel --hostname sub.domain.example.com and visiting it in the browser also results in an “ERR_SSL_VERSION_OR_CIPHER_MISMATCH” error.

Is there a way to create a valid certificate for the nested subdomain? If so, how I configure this for Argo?

Thanks!

You’d need ACM:

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