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CC2640R2F: How to reduce the unwanted emission at second order harmonic of SCLK_HF

Part Number: CC2640R2F

Team,

My customer has developed the board uses the CC2640R2F for the transceiver equipment. They has tried EMI testing and checking the emission. There is huge emission at 96MHz(second order harmonic of SCLK_HF?), have also tried to insert the damping resistor for the main xtal (24MHz) in order to reduce this. However, it cannot help to reduce the emission. They need to reduce at least 10dB than now.
I need your advice to reduce it. Could I have your advice on this?

Regards,
Nonaka