ProjectA is a matrix project with axis 'my-axis'. ProjectB is also a matrix project with axis 'my-axis'. ProjectB copy artifacts task is configured with Project Name: ProjectA/my-axis=$my-axis

When the build runs it fails with the following message:
Unable to find project for artifact copy: ProjectA/my-axis=$my-axis

It also fails when using ProjectA/my-axis=${my-axis}

It works if I remove the hypen (ProjectA/myaxis=$myaxis)