What happened in your environment?

My registry contains multiple repos under nested namespaces

base-images/dotnet/core/sdk
base-images/node
hello-world
samples/helm/wordpress
samples/text
samples/thingthang
samples/txt

I'd like to find the repos under the samples/ namespace

calling oras repo ls demo42.azurecr.io gives an appropriate listing
However, calling oras repo ls demo42.azurecr.io/samples gives:
Error: invalid reference: invalid registry

What did you expect to happen?

list the repos under the /samples namespace. This would also be the case for something like docker that lists repos under an org namespace, although docker hub doesn't support the _catalog API :(

How can we reproduce it?

oras push $REGISTRY/samples/artifact:1.0 \
    --config /dev/null:readme/example\
    ./readme.md:application/markdown

oras repo ls $REGISTRY/samples

What is the version of your ORAS CLI?

0.16.0

What is your OS environment?

wsl2

Are you willing to submit PRs to fix it?

• Yes, I am willing to fix it.