Problem adding new board to blinky example

I'm learning to use the nRF Connect SDK (with Visual Studio Code as the environment) to try and develop a product using the nRF 52840. Rather than a full development kit, what I have to work with are some of the XIAO nRF52840 board by Seeed Studio - basically just the chip, an aerial and a couple of LEDs. While attempting to build/upload to the board for the first time, using the zephyr/samples/basic/blinky template, I got the following error:

According to the README file, this is due to the board not being supported. I added the XIAO board using the following inputs:

And added a devicetree overlay to enable the gpio0 port, along with defining/aliasing the 3 LED pins:

Despite the devicetree overlay being the suggested solution in the README, the error persists. Am I missing something obvious?

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