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1. Prepare a SharePoint global administrator account to create a 'full-trust' SharePoint App.
2. Make sure that your tenant allows custom Apps authentication in order for the SharePoint App to securely communicate with the SharePoint API.  
   

   Note: In case your tenant has this option disabled and DisableCustomAppAuthentication is set to True (note that it is disabled by default for SharePoint Online tenants created on August 2020 or later), you can execute the following command in SharePoint Online Management Shell in order to enable it:

   Code Block
   Set-SPOTenant -DisableCustomAppAuthentication $false

3. Make sure that the site collections you would like to track are not locked with NoAccess state.
4. If end users are using IE 9/10/11 with Medium-High security level and above, they will have to manually enable the IE Active Scripting option for the appropriate security zone as follows: Open IE -> Tools -> Internet
   Options -> Security -> Choose the appropriate security zone (Internet Zone most likely) -> Custom Level... -> Scripting -> Enable the Active Scripting option. Another option is to add the event listener host URL to a IE security zone with Medium or lower security level (e.g. Trusted Sites) or to add the Azure event listener host URL to Trusted Sites. If end users are using IE 9, they will also have to manually enable the Access data sources across domain option as follows: Open IE -> Tools -> Internet Options -> Security -> Choose the relevant security zone (Internet Zone most likely) -> Custom Level... -> Miscellaneous -> Enable the Access data sources across domains option.

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