Follow these steps to check and assign the security privilege for a security role:
Go to Settings > Security.
Click Security Roles.
Choose a security role > Business Management tab.
In the Privacy Related Privileges section, verify that Dynamics 365 for mobile is set to Organization. If not, click Dynamics 365 for mobile.
Click Save and Close to save the changes to the security role.
Send an email to tablet-enabled users to let them know they can download the mobile app from the app store. Include the organization URL and sign-in information in the email.
This applies to new installations of Dynamics 365 for Customer Engagement, Dynamics CRM 2013 or later. You can add or remove this privilege from custom or default security roles to meet your business needs.