Do you know if your windows 10 is a default UEFI install?
Did you install Linux Mint UEFI? If windows is a UEFI and you did not install Mint UEFI, the Mint Grub will not boot windows.
Which installation option did you use for Mint? The Something Else option is generally recommended. During the Installation Type screen, were your windows partitions shown?
Which instructions/tutorial did you use to install Mint? Post a link if you can. The link below is such a tutorial, read through it and compare the instructions to what you did.
https://www.tecmint.com/install-linu...oot-uefi-mode/
