Hi,
You can just apply Workbook Reader role to those users. Additionally make sure that they have enough permissions to view the data in the workbook. That depends on what data the workbook is visualizing. For example if you visualize metrics you need Reader role on those resources for which metrics will be displayed. If you visualize logs from Log analytics you either need Monitoring Reader on the resource which for which these logs apply or on the Log analytics workspace. That depends on the access mode of your Log Analytics workspace.
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