Windows 11 and Red Hat Enterprise Linux 9 dual boot not working with GRUB

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I have problems with RHEL 9 and Windows 11 in GRUB.

I added menuentry "Windows 11" {set root=(sda1) chainloader +1} to /etc/grub.d/40_custom and then executed the command grub2-mkconfig --output=/boot/grub2/grub.cfg, the Windows 11 shows in the GRUB menu but the error below comes.
Windows 11 efi partition is in sda1.

The GRUB menu will show up in startup when pushing shift at startup, but when I select RHEL or Windows 11 it shows error message: error ../../grub-core/net/net.c:1394:no server is specified and error ../../grub-core/loader/i386/pc/linux.c:422:you need to load the kernel first.

Windows 11 has been installed with GUID partition table and I am using UEFI mode.
I have installed RHEL 9 with GPT and MBR, but always the same result.
I think whole of operating systems must be use the same partition type, in this situation GPT.

Windows 11 fast boot is disabled.
Windows 11 is in drive sda and RHEL 9 in drive sdb, so the operating systems are in separate drives.

So, anyone know how can I dual boot the RHEL 9 and Windows 11 with GRUB ?

AL

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