Mentioned at https://docs.microsoft.com/en-us/dotnet/api/microsoft.crm.sdk.messages.retrieveabsoluteandsitecollectionurlrequest?view=dynamics-general-ce-9, this SDK RetrieveAbsoluteAndSiteCollectionUrlRequest message can be used for earlier SharePoint version. Microsoft never promised it would work for SharePoint online integration
- We need alternate approach for code development to work with Share Point online