Can you provide the link where you signed up for the Windows Developer for IoT?
I guess it's at Windows on Devices, and they have gotten a lot of signups, way more that there is hardware as far as I understand, and for now MVPs have been prioritized.
They don't promise you a board, and they won't be giving boards to everyone that signed up.
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Unfortunately the Windows on Devices program is 100% driven by Microsoft. Please contact them for support on this.