XBee Series 3 ND Timeout Issue?

I have my NT value set to 0x0A but the ND acknowledge message – which usually comes at the end of the ND window – never arrives. The maximum NT value is 0xFC which means this ack message should show up in about 25 seconds. It doesn’t. In XCTU I had to stop the scan manually.

Is there a change in Series 3 ignores the NT value?

Set the C8 parameter.

Thank you. That did the trick.