There were no valid user or no valid group when I try to mount NTFS partition with ntfs-3g usermap

I want to mount a NTFS external drive that must have read and write access for my user profile. So following the NTFS-3G guide, to generate the mapping file, I have tried this:

sudo ntfsusermap /dev/sda1

when I launch this command, it asks me to input the user UID, so I input 1000 that is my account UID and I get the message:

You have defined no group, this can cause problems Do you acceptdefining a standard group ?

(I suspect this is the cause of the issue but it hasn't asked me to indicate the GID, so I don't know how it's supposed to set it correctly in the mapping file creation procedure)

The generated mapping file has following structure

# Generated by ntfsusermap for Linux, v 1.2.0:p1:S-1-5-21-7728005000-258165423-2201256221-513p1:p1:S-1-5-21-7728005000-258165423-2201256221-1001

And last line S-1-5-21-7728005000-258165423-2201256221-1001match exactly the SID of the Windows user account used to write the files already present on the external hard drive I want to map.

then I move the mapping file in .NTFS-3G folder inside the disk and edit fstab adding the line

UUID=<MYDISKUID> /home/<mymountpoint> ntfs-3g defaults,dmode=770,fmode=660 0 0

now, if I try to mount the drive, I get the error:

There were no valid user or no valid group