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I can think of two possibilities.
First, make sure that your users have permissions to access the data source as well as the dashboard. This is common in cases where you are using an extract that is published under a different project.
Second, make sure that your users have "Interactor" rights to the dashboard. If they only have "Viewer" rights, they will not be able to interact with the dashboard.
Let me know if either of these are helpful.