If your AOI tab is missing, or want to check to see if the add-in is disabled or enabled then please see the following:
Check Add-in is enabled
Click Microsoft Excel then click File.
Click Options then click Add-ins.
Click the Manage drop-down and select COM Add-ins.
Click Go.
Select Access Office Integration For Microsoft Excel <Office Version>.
Click OK then click OK.
Note: If a message doesn’t appear, select one of the checkboxes and click in the bottom right corner of the main monitor.
Check Add-in is disabled
Click Microsoft Excel then click File.
Click Options then click Add-ins.
Click the Manage drop-down and select Disabled Items.
Click Go then check the add-in is available.
Select Access Office Integration For Microsoft Excel <Office Version>.
Click Enable then click Close.
Check Trust Center Add-in settings
Click Microsoft Excel then click File.
Click Options then click Trust Center.
Click Trust Center Settings then click Add-ins.
Don't select Disable all Application Add-ins (may impair functionality).
Click Save.