As a solution to the "Access denied" issue, you should log out from the Magento admin area and then log in again.

If the above does not help, you should reset the admin privileges. This can be done through the Magento admin area >System > Permissions > Roles > Administrators.

Click on the Role Resources option from the left menu and make sure that Resource Access is set to All.

Click on the Save Role button and the permissions will be reset.

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