Access Denied to GitLab Dependency Proxy

I’m unable to pull images from GitLab dependency_proxy, both inside the CI/CD processes and from my command line docker.

From my machine:
I have performed the docker login with my username/password (I have the access to the group as administrator). The command completes successfully.
Then I try to perform a

docker pull "git.cedac.com/aggregatori/dependency_proxy/containers/alpine:latest"

(where aggregatori is the group name and git.cedac.com is the hostname of my on premise instance). I only obtain the message

Error response from daemon: pull access denied for git.cedac.com/aggregatori/dependency_proxy/containers/alpine, repository does not exist or may require 'docker login': denied: requested access to the resource is denied

On the gitlab machine I have the following logs:

2021-10-29_12:28:59.78790 time="2021-10-29T14:28:59.787+02:00" level=warning msg="error authorizing context: authorization token required" correlation_id=01FK60CNG327YAVNW74RAB6PT8 go_version=go1.16.4 root_repo=
2021-10-29_12:28:59.78796 {"content_type":"application/json","correlation_id":"01FK60CNG327YAVNW74RAB6PT8","duration_ms":8,"host":"git.cedac.com","level":"info","method":"GET","msg":"access","proto":"HTTP/1.1","referrer":"","remote_addr":"127.0.0.1:40234","remote_ip":"127.0.0.1","status":401,"system":"http","time":"2021-10-29T14:28:59.787+02:00","ttfb_ms":8,"uri":"/v2/","user_agent":"docker/20.10.8 go/go1.16.6 git-commit/75249d8 kernel/5.10.47-linuxkit os/linux arch/amd64 UpstreamClient(Docker-Client/20.10.8 \\(darwin\\))","written_bytes":87}
2021-10-29_12:29:00.29012 time="2021-10-29T14:29:00.290+02:00" level=warning msg="error authorizing context: insufficient scope" correlation_id=01FK60CNZZBMASJP2TPMH9K2K6 go_version=go1.16.4 root_repo=aggregatori vars_name=aggregatori/dependency_proxy/containers/alpine vars_reference=latest
2021-10-29_12:29:00.29030 {"content_type":"application/json","correlation_id":"01FK60CNZZBMASJP2TPMH9K2K6","duration_ms":2,"host":"git.cedac.com","level":"info","method":"HEAD","msg":"access","proto":"HTTP/1.1","referrer":"","remote_addr":"127.0.0.1:40238","remote_ip":"127.0.0.1","status":401,"system":"http","time":"2021-10-29T14:29:00.290+02:00","ttfb_ms":2,"uri":"/v2/aggregatori/dependency_proxy/containers/alpine/manifests/latest","user_agent":"docker/20.10.8 go/go1.16.6 git-commit/75249d8 kernel/5.10.47-linuxkit os/linux arch/amd64 UpstreamClient(Docker-Client/20.10.8 \\(darwin\\))","written_bytes":189}
2021-10-29_12:29:00.45978 time="2021-10-29T14:29:00.459+02:00" level=warning msg="error authorizing context: insufficient scope" correlation_id=01FK60CP581G24FWRWRKBRYMJ4 go_version=go1.16.4 root_repo=aggregatori vars_name=aggregatori/dependency_proxy/containers/alpine vars_reference=latest
2021-10-29_12:29:00.46009 {"content_type":"application/json","correlation_id":"01FK60CP581G24FWRWRKBRYMJ4","duration_ms":3,"host":"git.cedac.com","level":"info","method":"GET","msg":"access","proto":"HTTP/1.1","referrer":"","remote_addr":"127.0.0.1:40240","remote_ip":"127.0.0.1","status":401,"system":"http","time":"2021-10-29T14:29:00.459+02:00","ttfb_ms":3,"uri":"/v2/aggregatori/dependency_proxy/containers/alpine/manifests/latest","user_agent":"docker/20.10.8 go/go1.16.6 git-commit/75249d8 kernel/5.10.47-linuxkit os/linux arch/amd64 UpstreamClient(Docker-Client/20.10.8 \\(darwin\\))","written_bytes":189}

I got a similar problem inside the CI/CD using the environment variables in order to authenticate and get the image.

Can anyone help me?
Thank you in advance

Mauro