Thank you…
After using your commands everything worked until this command from the linked website.
grub-install --recheck /dev/nvme0n1p1
The solution was working
grub2-install --recheck /dev/nvme0n1p1
The next command also did not worked
update-grub
This command was working
pop-os:/ # grub2-mkconfig -o /boot/grub2/grub.cfg
Generating grub configuration file …
Found theme: /boot/grub2/themes/openSUSE/theme.txt
Found linux image: /boot/vmlinuz-6.2.1-1-default
Found initrd image: /boot/initrd-6.2.1-1-default
Found linux image: /boot/vmlinuz-6.2.0-1-default
Found initrd image: /boot/initrd-6.2.0-1-default
Warning: os-prober will be executed to detect other bootable partitions.
Its output will be used to detect bootable binaries on them and create new boot entries.
8631.112800 | DM multipath kernel driver not loaded
WARNING: failed to init udev for external device info, using none.
grub2-probe: error: cannot find a GRUB drive for /dev/sdb1. Check your device.map.
Found Windows 10 on /dev/sda1
Found Windows 10 on /dev/sda2
done
Now I will restart.
Hope it works now 