Microsoft announced early this month that they’ve identified an issue with five methods belonging to the WebPartPageWebService API that have cause an impact on data integrity. These methods are AddWebPart, AddWebPartToZone, SaveWebPart, SaveWebPart2, and GetWebPartPageConnectionInfo. As a result, these methods will be retired in early to mid-October 2020.
The affected methods in the SharePoint SoapServer were called primarily to migrate web parts from classic SharePoint sites to SharePoint Online. Once these methods are retired, they will no longer return any data. You can find alternative methods in the SharePoint Client-Side Object Model (CSOM) to achieve this functionality.
For admins and developers: If your software is currently calling any of the five aforementioned SoapServer endpoints, you’ll need to modify the software to instead call methods in the LimitedWebPartManager class of the SharePoint CSOM (version 16.1.20324.12000, or newer). This class includes a new HasWebPartConnections property that allows you to determine whether a web part page connection exists.
Posted by Eric Gregorich, Sr. Solutions Architect