To access security roles:
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Sign in to the Power Platform Admin center as a System Administrator.
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In the navigation pane, select Manage.
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In the Manage pane, select Environments, and then select an environment from the list.
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Select Settings.
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Select Users + permissions, and then select Users.
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On the Users page select a user, and then select Manage security roles.
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Select or deselect security roles. When finished, select Save. After saving, all selected roles become the current assigned roles for the user. Unselected roles aren't assigned.