Back to the original issue. I'm having the same problem. My students are not getting a grade link from the main page nor can they see grades directly from each assignment page. I've checked all the settings mentioned above with no success. After checking other threads I found several others with this issue as well, including one person who said he had solved it yet decided to pose that solution as a challenge to the community rather than sharing what he had found.
Student view -admin/grades
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