why does SQL Server ignore index?

CREATE TABLE [fct].[VMP10MinData](
    [VMP10MinDataID] [bigint] IDENTITY(1,1) NOT NULL,
    [DT1TurbineID] [int] NOT NULL,
    [DT1TurbineEventID] [int] NOT NULL,
    [TTimeStamp] [smalldatetime] NOT NULL,
    [TTimeStampUTC] [smalldatetime] NOT NULL,
    [Gen_RPM_Max] [numeric](9, 1) NULL,
    ...
    [Grd_InverterPhase1_Temp_AvgA] [smallint] NULL,
    [UpdatedDate] [datetime] NOT NULL,
    [IsCorrected] [bit] NOT NULL,
    [TRATransformJobID] [int] NOT NULL,
    [TTimeStampLocal] [smalldatetime] NOT NULL,
    [UpdatedID] [bigint] NULL,
CONSTRAINT [PK_VMP10MinData] PRIMARY KEY CLUSTERED 
(
    [DT1TurbineID] ASC,
    [TTimeStamp] ASC
)WITH (DATA_COMPRESSION = ROW ON PARTITIONS (207 TO 253),
DATA_COMPRESSION = PAGE ON PARTITIONS (1 TO 206)) ON [PS_FctVMP10MinData1]([TTimeStamp])
) ON [PS_FctVMP10MinData1]([TTimeStamp])
GO
 
CREATE UNIQUE NONCLUSTERED INDEX [IX_DT1TurbineID_PCTimeStamp_TTimeStamp] ON [fct].[VMP10MinData]
(
    [DT1TurbineID] ASC,
    [PCTimeStamp] ASC,
    [TTimeStamp] ASC
)WITH (DATA_COMPRESSION = ROW) ON [PS_FctVMP10MinData1]([TTimeStamp])
GO
 
CREATE UNIQUE NONCLUSTERED INDEX [IX_DT1TurbineID_TTimeStamp_TTimeStampUTC] ON [fct].[VMP10MinData]
(
    [DT1TurbineID] ASC,
    [TTimeStamp] ASC,
    [TTimeStampUTC] ASC
)
INCLUDE (   [DT1TurbineEventID],
    [Amb_LaPM_ActSectorInPeriod],
    [Amb_WindSpeed_Avg],
    [Amb_Temp_Avg],
    [Grd_Prod_PsblePwr_Avg],
    [Grd_Prod_Pwr_Avg],
    [Grd_Prod_Pwr_InternalDerateStat],
    [Grd_Sets_ActPwr_Source10Min],
    [Grd_Sets_ActPwr_ReferenceValue10Min],
    [HCnt_Avg_Tot],
    [HCnt_Avg_Gen1],
    [HCnt_Avg_Gen2],
    [HCnt_Avg_GrdOn],
    [HCnt_Avg_GrdOk],
    [HCnt_Avg_TrbOk],
    [HCnt_Avg_AlarmAct],
    [HCnt_Avg_Run],
    [HCnt_Avg_SrvOn],
    [HCnt_Avg_AmbOk],
    [HCnt_Avg_WindOk],
    [HCnt_TotAccumulated_Gen1],
    [HCnt_TotAccumulated_Gen2],
    [HCnt_TotAccumulated_GrdOn],
    [HCnt_TotAccumulated_WindOk],
    [Nac_Direction_Avg],
    [Prod_TotAccumulated_TotActPwr],
    [Sys_Logs_FirstActAlarmPar1],
    [Sys_Logs_FirstActAlarmPar2],
    [TTimeStampLocal],
    [VMP10MinDataID]) WITH (DROP_EXISTING = OFF, ONLINE = OFF, DATA_COMPRESSION = ROW) ON [PS_FctVMP10MinData1]([TTimeStamp])
GO
 
CREATE UNIQUE NONCLUSTERED INDEX [IX_TTimeStamp_DT1TurbineID] ON [fct].[VMP10MinData]
(
    [TTimeStamp] ASC,
    [DT1TurbineID] ASC
)WITH (DATA_COMPRESSION = ROW) ON [PS_FctVMP10MinData1]([TTimeStamp])
GO
 
CREATE UNIQUE NONCLUSTERED INDEX [IX_UpdatedID_DT1TurbineID_TTimeStamp] ON [fct].[VMP10MinData]
(
    [UpdatedID] ASC,
    [DT1TurbineID] ASC,
    [TTimeStamp] ASC
)
INCLUDE (   [UpdatedDate]) 
WHERE ([UpdatedID] IS NOT NULL)
WITH (DATA_COMPRESSION = ROW) ON [PS_FctVMP10MinData1]([TTimeStamp])
GO
 
CREATE UNIQUE NONCLUSTERED INDEX [IX_VMP10MinDataID_TTimeStamp] ON [fct].[VMP10MinData]
(
    [VMP10MinDataID] ASC,
    [TTimeStamp] ASC
)WITH (DATA_COMPRESSION = ROW) ON [PS_FctVMP10MinData1]([TTimeStamp])
GO