Soldering Fox crystals

We are trying to reflow some Fox brand crystals to some boards but the solder will not wick up on the ends of the component. It solders fine to the under side but not to the ends. I have tried numerous things with the reflow profile but nothing seems to have an effect on this part. It is a lead-free component and we are using lead-free solder paste. any ideas as to how to resolve this problem would be a big help. Thanks,

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