Hi,
The branding and hence intergration of AMEX and FD in 1 card is only available in the Netherlands. If you spoke to FD Helpdesk in NL they have no clue about the non-Dutch AMEX offers like the 25k miles. That's probably the reason why he/she told you that the number should be on there.
Bastiaan
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KLM - Platinum
HHonors - GOLD VIP
BA - Silver
LH - FT