If I understand your problem correctly, setting the report as Global is irrelevant - a global report is accessible across all Courses, not across all user roles.
Since you have manually set the View Reports permission for Students and Teachers (as seen in the third screenshot), maybe try changing the permission in the permissions tab (second screenshot) from 'Anyone' to 'Report Capabilities'?
It should have the same effect in this case. If that doesn't work, could you specify exactly how you test whether or not the report is accessible?
For me the feature (permission: 'Anyone') works as expected on Moodle 2.9, but I've only tested that by changing my role temporarily to student using 'switch role to...'