SP Not Inserting A New Row

I create this SP and I am expecting it to insert a new row but that is not happening.  What's the best way to handle this?

 (@BatchID         9cfb9462-6b85-495c-9b66-db2e8d41329a)


======================================================================

ALTER PROCEDURE [dbo].[PushNotificationBatchWrite]
      (
      @BatchID                          uniqueidentifier,
      @SentYN                        char(1) = null,
      @SentTimestamp            datetime = null,
      @MFUpdatedYN                    char(1) = null,
      @MFUpdatedTimestamp      datetime = null
      )
AS

IF (@SentYN = NULL) AND (@MFUpdatedYN = NULL)
      --insert the new batch ID row
      BEGIN
            SET NOCOUNT ON;

            INSERT INTO [dbo].[PushNotificationBatch] (BatchID) VALUES (@BatchID);

            SET NOCOUNT OFF;
      END
ELSE
      BEGIN
            IF @MFUpdatedYN IS NOT NULL
                  BEGIN
                        --set the batch ID as updated on the mainframe

                        UPDATE [dbo].[PushNotificationBatch]
                           SET [MFUpdatedYN] = @MFUpdatedYN
                                ,[MFUpdatedTimestamp] = @MFUpdatedTimestamp
                         WHERE BatchID = @BatchID
                        
                   END

            IF @SentYN IS NOT NULL
                  BEGIN
                        --set the batch ID as sent to the vendor
                        UPDATE [dbo].[PushNotificationBatch]
                           SET [SentYN] = @SentYN
                                ,[SentTimestamp] = @SentTimestamp
                         WHERE BatchID = @BatchID
                        
                   END
      END