I also had problems with the integrated Intel graphics on a Z690-I build. WIndows failed to load every time I tried using the integrated graphics along with an NVMe M2; worked fine with a SATA M2 installed. Once I installed my dedicated graphics care, the system installed Win11 on the NVMe M2 and runs fine. Not sure what's going on, but it seems that the PCIe bus has a conflict when running a NVMe M2 and the integrated CPU graphics at the same time. The same issue was present on two Z690-I MBs, so unless both boards had the exact same chipset failure, it seems like a systemic problem. Not good . . .