Second-stage Upgradable bootloader with SDK 2.7

We are trying to setup with NRF Connect with SDK 2.7 a software with the second stage upgradable bootloader, we use sysbuild and Mcuboot as second stage upgradable bootloader as reported in the documentation, but the software is not booting.

With only Mcuboot or NSIB(b0) is working perfectly. Is there an example with the correct setup for this case with sysbuild?

We tried several configuration but we are stuck and we can't find more on documentation.

Thanks

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