Add mcuboot to hello_world sample does not work in SDK 2.8.0

Hi, I started my project with SDK version 2.6.1 (starting from the 'hello_world' example). I added mcuboot (CONFIG_BOOTLOADER_MCUBOOT=y). I followed the instructions in the Nordic video 'Adding Device Firmware Update(DFU/FOTA) Support in nrf Connect SDK'. After creating and flashing the application, I can see that the bootloader starts and then the application starts. I tried again with SDK version 2.8.0 and found that adding mcuboot no longer works. The build process completes successfully. I just get the warning message 'The active build context does not use this file.'. But no mcboot was created. After flashing, the application just starts without a bootloader. What did I do wrong? What is the difference between SDK 2.6.1 and SDK 2.8.0 regarding mcuboot? I am working on Windows 11 with the latest version of Visual Studio Code.

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