Will,
   You can see the firmware whitelist here: repos/pc/src/lib/wifi/firmware.cc. It seems to request firmware that isn’t on the list. Presumably this means your wifi card is a slightly different model from others, but it might still work with the firmware. If you are building Sculpt from source (there are instructions for it on the sculpt page), you can probably
1) Find the referenced file in your Linux system (if you have Linux installed).
2) As a temporary solution, add that file to repos/dde_linux/recipes/raw and modify repos/dde_linux/recipes/raw/wifi_firmware/content.mk with something like
cp $(REP_DIR)/recipes/raw/wifi_firmware/*.ucode .
 in the ucode_files recipe.
3) Modify the firmware.cc file to add the ucode you need along with its size.
4) Add a gen_parent_rom_route stanza to repos/gems/src/app/sculpt_manager/runtime/wifi_drv.cc.

Hopefully that helps?