If you want to include SharePoint Online and OneDrive for Business locations in an Office 365 content search, you need to know the URLs of the target sites. Finding the URLs can be problematic, but here’s some easy ways to do the job. PowerShell, as usual, comes up trumps…
https://office365itpros.com/2019/09/18/discovering-urls-sharepoint-online-onedrive-for-business/
