Outlook add-in configuration
Please refer Install Outlook Add-In to install the add-in.
Note
OneList Outlook add-in is compatible with the Outlook for Windows (classic) Desktop.
The New Outlook for Windows does not support Windows (desktop) COM add-ins.
Steps to configure the OneList URL
Select the OneList tab on Outlook ribbon;
Click the Settings button to launch the OneList Settings window;
Enter the OneList URL, e.g. https://iqx.onelistapprovals.com;
Click the OK button to save the change.