Getting a not supported registry warning while using configure-docker on a supported location

I am trying to deploy a Docker image into Google Cloud Artifact Registry in a new location: europe-southwest1. To do so, first, I’ve checked that it is supported:

gcloud artifacts locations list

As expected, a list of locations is returned, where I can see the one I’m interested on:

LOCATIONS
asia
asia-east1
asia-east2
asia-northeast1
asia-northeast2
asia-northeast3
asia-south1
asia-south2
asia-southeast1
asia-southeast2
australia-southeast1
australia-southeast2
europe
europe-central2
europe-north1
europe-southwest1 <--- this is the one
europe-west1
europe-west2
europe-west3
europe-west4
europe-west6
europe-west8
europe-west9
northamerica-northeast1
northamerica-northeast2
southamerica-east1
southamerica-west1
us
us-central1
us-east1
us-east4
us-east5
us-west1
us-west2
us-west3
us-west4

Then, I’ve tried to configure the new region in Docker:

gcloud auth configure-docker europe-southwest1-docker.pkg.dev

But a warning is returned stating that it is not a supported registry:

WARNING: Your config file at [/Users/ghostmou/.docker/config.json] contains these credential helper entries:

{
  "credHelpers": {
    "gcr.io": "gcloud",
    "us.gcr.io": "gcloud",
    "eu.gcr.io": "gcloud",
    "asia.gcr.io": "gcloud",
    "staging-k8s.gcr.io": "gcloud",
    "marketplace.gcr.io": "gcloud"
  }
}
Adding credentials for: europe-southwest1-docker.pkg.dev
WARNING: europe-southwest1-docker.pkg.dev is not a supported registry
gcloud credential helpers already registered correctly.

I’ve tried with other regions, for example us-central1-docker.pkg.dev, and it works as expected:

{
  "credHelpers": {
    "gcr.io": "gcloud",
    "us.gcr.io": "gcloud",
    "eu.gcr.io": "gcloud",
    "asia.gcr.io": "gcloud",
    "staging-k8s.gcr.io": "gcloud",
    "marketplace.gcr.io": "gcloud",
    "us-central1-docker.pkg.dev": "gcloud"
  }
}
Adding credentials for: us-central1-docker.pkg.dev
gcloud credential helpers already registered correctly

Can anyone help me to know if I’m doing something wrong or if there are any issues with europe-southwest1 region?