Can't auto mount partition through fstab during boot

help me understand.I have this line in my /etc/fstab

UUID=13958fbc-ce35-4a2a-a144-9b1543270cf4      /DAS1TB ext4    defaults        0       0

this UUID corresponds to /dev/sdb1 that should be mounted on /DAS1TB folder.

The problem is that the partition can't be visible during boot, and even after; let me explain better:after a normal boot through lsblk the output is just

NAME                      MAJ:MIN RM   SIZE RO TYPE MOUNTPOINTSsdb                         8:16   0   1.8T  0 disk

As you can see, it does not display /dev/sdb1 as partition of device sdb.

Only if I launch, for example, sudo fdisk /dev/sdb, I can see it through option p that allows to list partitions:

Disk /dev/sdb: 1.82 TiB, 2000347463680 bytes, 3906928640 sectorsDisk model: TR-002 DISK00Units: sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisklabel type: gptDevice     Start        End    Sectors  Size Type/dev/sdb1   2048 3906926591 3906924544  1.8T Linux filesystem

After that, quitting fdisk, I have a new output for lsblk, that changes in

NAME                      MAJ:MIN RM   SIZE RO TYPE MOUNTPOINTSsdb                         8:16   0   1.8T  0 disk└─sdb1                      8:17   0   1.8T  0 part

And executing sudo blkid /dev/sdb1 displays correctly

/dev/sdb1: UUID="13958fbc-ce35-4a2a-a144-9b1543270cf4" BLOCK_SIZE="4096" TYPE="ext4" PARTUUID="dc101b80-f889-4c41-bb32-43fee1fd9ddd"

I tried also using PARTUUID= instead of UUID= in `/etc/fstab'

PARTUUID=6dd2947d-377e-4080-819f-a00f8c9d4462      /DAS1TB ext4    defaults        0       0

But again, the partition is initially not visible, if not forcing the check of the contents of the gpt table using, for example, fdisk command.

During boot, and after that, it is not discovered/located.

Further info: the device is a DAS (Direct Attached Storage) with 2-bays in RAID1 (so, it results just as 1 mechanical HDD disk of 2TB), connected through USB3.2gen2 interface.

Could you help, please? I need /dev/sdb1 loaded during boot in auto.