Some of the joints you have selected can only have one wall joint type, so these joints haven't been changed.
Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 26.2.0.0 (26.2.0.0)
Syntax
C#
public static FailureDefinitionId FailedToChangeWallJointsTypeFailure { get; }