NTFS-3G mount with GPT / protective MBR

I got some WD 10TB HDDs, initialized them in Windows 10 with an external USB3.0 adapter and formatted them as NTFS / GPT. Now I want to mount them in my Debian system, but blkid does not show the UUID and cat /proc/partitions does only show sdb.

cat /proc/partitions
8       16 9766436864 sdb

blkid /dev/sdb
/dev/sdb: PTTYPE="PMBR"

gdisk -l /dev/sdb
GPT fdisk (gdisk) version 1.0.3

Partition table scan:
  MBR: protective
  BSD: not present
  APM: not present
  GPT: present

Found valid GPT with protective MBR; using GPT.
Disk /dev/sdb: 19532873728 sectors, 9.1 TiB
Model: WDC WD102KRYZ-01
Sector size (logical/physical): 512/4096 bytes
Disk identifier (GUID): 28154B70-704B-4769-A0F9-AC8FF5C0F724
Partition table holds up to 128 entries
Main partition table begins at sector 2 and ends at sector 33
First usable sector is 34, last usable sector is 19532873694
Partitions will be aligned on 2048-sector boundaries
Total free space is 19532873661 sectors (9.1 TiB)

Number  Start (sector)    End (sector)  Size       Code  Name

Here's the output of gdisk:

gdisk /dev/sdb

Expert command (? for help): o

Disk size is 19532873728 sectors (9.1 TiB)
MBR disk identifier: 0x00000000
MBR partitions:

Number  Boot  Start Sector   End Sector   Status      Code
   1                     1   4294967295   primary     0xEE

My other drive (sdc), which I also cannot mount, looks like this:

Partition table scan:
  MBR: protective
  BSD: not present
  APM: not present
  GPT: not present

It seems that there is an issue with GPT. How can I fix this, to mount the drive properly? I had this issue a year ago already with another drive, then I did clean the disk with diskpart within Windows 10 and re-initialised it, then the partition(s) did show up on my Debian system. The main problem now is, that the 10TB disks are already filled up with data...