1. create an env with azd env new -e someenv1
2. run azd up -e someenv2 -l eastus2 --subscription somesubid
3. if the someenv2 doesn't exist you are prompted to create it and then also prompted to select location and sub

If I provide -e, -l, --subscription, then I should not be prompted to create anything it should auto create the env and use location and sub I provided.