How can use FX7500_SDK enabled NXP UCode8 Inlay EAS

Hello
I am using FX7500 RFID. I am facing some issue.

Issue:
I want to use FX7500 to enable the EAS function of UCode8 chip.

Current operation:
I found the description of NXP Command in the FX7500 SDK operating manual. For the enabling of the EAS function, the description uses SetEASWait, whichallow setting or resetting the EAS bits on one or more NXP tags., but I encountered this error "Change EAS on tag failed" [MotoNXPOpSpecResult failed: No response from tag]", what is wrong? Please help me.

My Code: (C# language)
[Write page]
internal NXP.SetEASParams m_SetEAS = new NXP.SetEASParams();;
m_SetEAS.AccessPassword = 0;
m_SetEAS.SetEAS = true;
m_AppForm.accessBackgroundWorker.RunWorkerAsync(ACCESS_OPERATION_CODE.ACCESS_OPERATION_NXP_SET_EAS);

[m_AppForm page]
private void accessBackgroundWorker_DoWork(object sender, DoWorkEventArgs accessEvent)
{
if ((ACCESS_OPERATION_CODE)accessEvent.Argument == ACCESS_OPERATION_CODE.ACCESS_OPERATION_NXP_SET_EAS)
{
if (m_SelectedTagID != String.Empty)
{
m_ReaderAPI.Actions.TagAccess.NXP.SetEASWait(
m_SelectedTagID, m_WriteForm.m_SetEAS, m_AntennaInfoForm.getInfo());
}
else
{
m_ReaderAPI.Actions.TagAccess.NXP.SetEASEvent(
m_WriteForm.m_SetEAS, m_AccessFilterForm.getFilter(), m_AntennaInfoForm.getInfo());
}
}
}

Thanks.

Benny.