Not able to scan images form Github container registry

[shyam-ks]

anchore-cli, version 0.9.2

anchore-cli image add ghcr.io/org/xxx-2.0:831
Error: cannot fetch image digest/manifest from registry
HTTP Code: 400
Detail: {'error_codes': ['REGISTRY_PERMISSION_DENIED'], 'raw_exception_message': 'Error encountered in skopeo operation. cmd=/bin/sh -c skopeo
inspect --raw --tls-verify=false docker://ghcr.io/org/asset-2.0:831, rc=1, stdout=None, stderr=b'time="2022-01-17T10:05:20Z" level=fatal msg="Error parsing image name \\"docker://ghcr.io/org/xxx-2.0:831\\": unable to retrieve auth token: invalid username/password: unauthorized"\n', error_code=REGISTRY_PERMISSION_DENIED'}

anchore-cli registry add ghcr.io/org username token
Registry: ghcr.io/org
Name: ghcr.io/org
User: username
Type: docker_v2
Verify TLS: True
Created: 2022-01-17T09:59:53Z
Updated: 2022-01-17T09:59:53Z

Token has the right permissions but still its giving unauthorized