Resolved! make[1]: *** No rule to make target 'Image.gz'. Stop.
I've followed the READMEs for the installation of the dev package, source, and kernel and generated a build folder for the kernel as suggested at~/st/stm32mp2-openstlinux-6.6-yocto-scarthgap-mpu-v24.11.06/sdk/Developer-Package/stm32mp2-openstlinux-6....