Previously using Container Registry one could copy a container between projects using this method
However I am unable to get this working using Artifact Registry. If I try
gcloud artifacts docker tags add \
us-east4-docker.pkg.dev/source-proj/my-repo/my-image:latest \
us-east4-docker.pkg.dev/dest-proj/my-repo/my-image:latest
It gives the error
ERROR: (gcloud.artifacts.docker.tags.add) Image us-east4-docker.pkg.dev/source-proj/my-repo/my-image
does not match image us-east4-docker.pkg.dev/dest-proj/my-repo/my-image
I have searched and can not find any examples or documentation on how to do this.