Full disk encryption: How can I automatically unlock via a USB key on Silverblue?

Just gave it a little play and it works for me when I point to the luks partition following the Arch Linux wiki.

rd.luks.key=LUKS_PARTITION_UUID=/keys/testkey:UUID=USB_ID_HERE

Note: This is the UUID encrypted partition itself not the mapped device and without the “UUID=”

Oddly enough, doing what you did and following the Dracut man pages didn’t work for me either.
Let me know how you get on.

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