Add Windows 10 to grub

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Hi, I used to have Windows + Linux Mint in dualboot, but now I decided to install Fedora instead of Mint. I have Windows installed for about a month and now I finally have the time to Install fedora. However, the Windows 10 does not appear in grub.

What I already tried:

• grub-customizer. But it can't find Windows
• Adding custom entry in etc/grub.d/40_custom as said here https://ask.fedoraproject.org/en/ques...

But it didn't helped.

Output of grzb2-mkconfig

[ajezek@localhost ~]$ sudo grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg
[sudo] password for ajezek: 
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-4.8.6-300.fc25.x86_64
Found initrd image: /boot/initramfs-4.8.6-300.fc25.x86_64.img
Found linux image: /boot/vmlinuz-0-rescue-da325ed6b7fc41dab3e1b04fa22ea0b4
Found initrd image: /boot/initramfs-0-rescue-da325ed6b7fc41dab3e1b04fa22ea0b4.img
Found linux image: /boot/vmlinuz-4.8.6-300.fc25.x86_64
Found initrd image: /boot/initramfs-4.8.6-300.fc25.x86_64.img
Found linux image: /boot/vmlinuz-0-rescue-da325ed6b7fc41dab3e1b04fa22ea0b4
Found initrd image: /boot/initramfs-0-rescue-da325ed6b7fc41dab3e1b04fa22ea0b4.img
done

fdisk: (both Windows and Fedora installed on sdb (240GB SSD), sda is 1TB HDD with data only and some Lenovo recovery partition)

[ajezek@localhost ~]$ sudo fdisk -l
[sudo] password for ajezek: 
Disk /dev/sda: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: D1425B80-9CC2-4A00-9762-65C4E15D3D92

Device          Start        End    Sectors   Size Type
/dev/sda1        2048     923647     921600   450M Windows recovery environment
/dev/sda3   310075392 1921404927 1611329536 768.4G Microsoft basic data
/dev/sda4  1921404928 1953523711   32118784  15.3G Windows recovery environment


Disk /dev/sdb: 223.6 GiB, 240057409536 bytes, 468862128 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 503D3D3C-C8C7-4771-84A7-61335D527168

Device         Start       End   Sectors  Size Type
/dev/sdb1       2048     34815     32768   16M Microsoft reserved
/dev/sdb2     204800 419635199 419430400  200G Microsoft basic data
/dev/sdb3      34816    204799    169984   83M EFI System
/dev/sdb4  419635200 461578239  41943040   20G Linux filesystem
/dev/sdb5  461578240 467869695   6291456    3G Linux swap

Partition table entries are not in disk order.

Fedora was installed on sdb4 with EFI partition on sdb3. Windows is installed on sdb2.

GParted:

What should I do?

Thanks.