This is probably duplicate of https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1839317.
I have the same issue.
I can boot Windows 10 from BIOS/EFI boot menu, but can't boot it from grub.
Setting debug=chain shows that grub tries to use SecureBoot, but it's disabled.
This is probably duplicate of https:/ /bugs.launchpad .net/ubuntu/ +source/ grub2/+ bug/1839317.
I have the same issue.
I can boot Windows 10 from BIOS/EFI boot menu, but can't boot it from grub.
Setting debug=chain shows that grub tries to use SecureBoot, but it's disabled.