Grub has been installed but I dont see it on boot so cant dual boot

Today I installed my first Manjaro system. I am very new to linux and want to create a dual boot system with Windows 10. After successfully installing Manjaro through Architect I installed the boot loader and selected grub. Apparently it installed successfully but when I reboot my pc it just immediately boots into Manjaro with no grub screen or way of booting into Windows. My Windows and Manjaro installs are on separate sata m2 drives and not separate partitions. I tried reinstalling grub again from my Manjaro box (from my actual installation and not a live boot so I didnt chroot in). This is what happened when I reinstalled grub:

[mike@mikebox ~]$ sudo grub-install /dev/nvme0n1p1
[sudo] password for mike: 
Installing for x86_64-efi platform.
Installation finished. No error reported.
[mike@mikebox ~]$ sudo grub-install --recheck /dev/nvme0n1p1
Installing for x86_64-efi platform.
Installation finished. No error reported.
[mike@mikebox ~]$ sudo update-grub
Generating grub configuration file ...
Found theme: /usr/share/grub/themes/manjaro/theme.txt
Found linux image: /boot/vmlinuz-5.11-x86_64
Found initrd image: /boot/intel-ucode.img /boot/amd-ucode.img /boot/initramfs-5.11-x86_64.img
Found initrd fallback image: /boot/initramfs-5.11-x86_64-fallback.img
Warning: os-prober will not be executed to detect other bootable partitions.
Systems on them will not be added to the GRUB boot configuration.
Check GRUB_DISABLE_OS_PROBER documentation entry.
Adding boot menu entry for UEFI Firmware Settings ...
Found memtest86+ image: /boot/memtest86+/memtest.bin
/usr/bin/grub-probe: warning: unknown device type nvme0n1.

After I rebooted the same thing happened, straight back into Manjaro, no grub screen. The following is what my lsblk looks like

sda           8:0    0   1.8T  0 disk 
├─sda1        8:1    0    16M  0 part 
└─sda2        8:2    0   1.8T  0 part 
nvme0n1     259:0    0 465.8G  0 disk 
├─nvme0n1p1 259:2    0   512M  0 part /boot/efi
└─nvme0n1p2 259:3    0 465.3G  0 part /
nvme1n1     259:1    0 465.8G  0 disk 
├─nvme1n1p1 259:4    0   529M  0 part 
├─nvme1n1p2 259:5    0    99M  0 part 
├─nvme1n1p3 259:6    0    16M  0 part 
└─nvme1n1p4 259:7    0 465.1G  0 part 

sda is just a big empty data drive.
nvme0n1 is my manjaro drive (where root and boot are installed)
nvme1n1 is the windows disk drive.

It looks like grub doesnt know what to do with nvme1n1 or how to probe it.

So why am I currently not seeing Grub and just going straight to Manjaro (is it because only Manjaro is available?).
What do I need to do to get it to detect the windows drive to allow dual boot?


Did you read your screen?

One of many available information source about this


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