Error with initializing kb2040 project

I am trying to use kb2040 on VSCode PlatformIO and selected KB2040 (Adafruit) for Board and Arduino for Framework. However, I could not initialize the project and saw following error:

PIO Core Call Error: "Resolving adafruit_kb2040 dependencies...\r\n\n\nUnknownBoard: Unknown board ID 'adafruit_kb2040'"

I am sure that my development environment is up-to-date: Core is ver. 6.1.16 and Home is ver. 3.4.4.

How can I solve this error?

The board you are looking for is available in the develop branch of maxgerhardt’s fork: platform-raspberrypi.

To use this fork, change the platform in your platformio.ini:

platform = https://github.com/maxgerhardt/platform-raspberrypi#develop