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Hi there and welcome
Exactly how are you trying to add your new card? And what is the error you get when it fails?
This is usually an issue with the Firmware, so I would first like you to do this please.
Remove the charger from the Kindle and hold the power button to off for 35 seconds.
Release, then connect the charger and try to turn on the Kindle and order.
Let me know the results please