boot - Windows 10 does not show in grub menu (separate disk installation)

I was using windows 10 installed on a SSD plus an HHD for storage. Recently, I have added another ssd where I have installed Ubuntu 18.04.2 LTS

My problem is that neither os-prober nor grub can find windows 10. However, I am able to boot in windows 10 from the UEFI boot menu.
I read all the posts about it but could not solve the problem. Can you please help me?

Here is the output from boot info
Boot Info Script 0.61 [1 April 2012]

============================= Boot Info Summary: ===============================

=> Windows is installed in the MBR of /dev/sda.
=> Windows is installed in the MBR of /dev/sdb.
=> Windows is installed in the MBR of /dev/sdc.

sda1: __________________________________________________________________________

File system:       ntfs
Boot sector type:  Windows Vista/7: NTFS
Boot sector info:  No errors found in the Boot Parameter Block.

Operating System:  
Boot files:        /bootmgr /Boot/BCD /Windows/System32/winload.exe

sda2: __________________________________________________________________________

File system:       ntfs
Boot sector type:  Windows Vista/7: NTFS
Boot sector info:  No errors found in the Boot Parameter Block.
Operating System:  

Boot files:        

sdb1: __________________________________________________________________________

File system:       
Boot sector type:  -
Boot sector info: 
Mounting failed:   mount: /tmp/BootInfo-OmyD6Lmf/sdb1: unknown filesystem type ''.

sdb2: __________________________________________________________________________

File system:       ntfs
Boot sector type:  Windows Vista/7: NTFS
Boot sector info:  No errors found in the Boot Parameter Block.
Operating System:  
Boot files:        

sdc1: __________________________________________________________________________

File system:       vfat
Boot sector type:  FAT32
Boot sector info:  No errors found in the Boot Parameter Block.
Operating System:  
Boot files:        /efi/BOOT/fbx64.efi /efi/ubuntu/fwupx64.efi 
                   /efi/ubuntu/grubx64.efi /efi/ubuntu/mmx64.efi 
                   /efi/ubuntu/shimx64.efi

sdc2: __________________________________________________________________________

File system:       ext4
Boot sector type:  -
Boot sector info: 
Operating System:  Ubuntu 18.04.2 LTS
Boot files:        /boot/grub/grub.cfg /etc/fstab

============================ Drive/Partition Info: =============================

Drive: sda _____________________________________________________________________
Disk /dev/sda: 111,8 GiB, 120034123776 bytes, 234441648 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: dos

Partition Boot Start Sector End Sector # of Sectors Id System

/dev/sda1 * 2,048 233,517,055 233,515,008 7 NTFS / exFAT / HPFS
/dev/sda2 233,517,056 234,438,655 921,600 27 Hidden NTFS (Recovery Environment)

Drive: sdb _____________________________________________________________________
Disk /dev/sdb: 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

Partition Boot Start Sector End Sector # of Sectors Id System

/dev/sdb1 1 4,294,967,295 4,294,967,295 ee GPT

/dev/sdb1 ends after the last sector of /dev/sdb

GUID Partition Table detected.

Partition Start Sector End Sector # of Sectors System

/dev/sdb1 34 262,177 262,144 Microsoft Reserved Partition (Windows)
/dev/sdb2 264,192 1,953,523,711 1,953,259,520 Data partition (Windows/Linux)

Drive: sdc _____________________________________________________________________
Disk /dev/sdc: 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

Partition Boot Start Sector End Sector # of Sectors Id System

/dev/sdc1 1 468,862,127 468,862,127 ee GPT

GUID Partition Table detected.

Partition Start Sector End Sector # of Sectors System
/dev/sdc1 2,048 1,050,623 1,048,576 EFI System partition
/dev/sdc2 1,050,624 468,860,927 467,810,304 Data partition (Linux)

"blkid" output: ________________________________________________________________

Device UUID TYPE LABEL

/dev/loop0 squashfs
/dev/loop1 squashfs
/dev/loop10 squashfs
/dev/loop11 squashfs
/dev/loop12 squashfs
/dev/loop13 squashfs
/dev/loop14 squashfs
/dev/loop15 squashfs
/dev/loop16 squashfs
/dev/loop17 squashfs
/dev/loop2 squashfs
/dev/loop3 squashfs
/dev/loop4 squashfs
/dev/loop5 squashfs
/dev/loop6 squashfs
/dev/loop7 squashfs
/dev/loop8 squashfs
/dev/loop9 squashfs
/dev/sda1 6EAEC608AEC5C933 ntfs Fisso
/dev/sda2 34D8E21FD8E1DEDC ntfs
/dev/sdb1
/dev/sdb2 1688449A884479EF ntfs Fisso exp
/dev/sdc1 3BCC-705C vfat
/dev/sdc2 b64bdc97-1ec9-4a7f-a4f6-7e0e51b54f2d ext4

================================ Mount points: =================================

Device Mount_Point Type Options

/dev/sdc1 /boot/efi vfat (rw,relatime,fmask=0077,dmask=0077,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro)
/dev/sdc2 / ext4 (rw,relatime,errors=remount-ro)

=========================== sdc2/boot/grub/grub.cfg: ===========================