Hi Nicholas,
" Agent Advanced Operation " Permission will be at the " Applications " tab in "Roles" section tied to the user. Once you are in the "Applications" tab, look for " Default Permissions " and then click on " Edit" . It will open a new window " Edit Permissions ". The very first Permission listed in the window will be " Agent Advanced Operation"
Administration - Roles - Applications - Default Permissions - Edit
Also, attaching an image for your reference. Hope, this helps.
Thanks,
Sunil
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