Veracrypt with /etc/udev/rules.d

Question

Consider that I have /etc/udev/rules.d/91-checkveracrypt.rules:

ACTION=="add", ATTRS{idVendor}=="1234", ATTRS{idProduct}=="1234", RUN+="/home/user/tryveracrypt.sh"

/home/user/tryveracrypt.sh:

reqsubstr="/dev/disk/by-id/usb-AAAAA-0:0-part1"
for word in $DEVLINKS
do
  if [ "$word" == "$reqsubstr" ] ; then
     /usr/bin/su user -c '/bin/bash /home/user/mountveracrypt.sh'
     exit
  fi
done

And finally mountveracrypt.sh:

sudo veracrypt -t -k /home/user/key -p "" --pim=0 --protect-hidden=no /dev/disk/by-id/usb-AAAAA-0:0-part1 --slot=1 --verbose --non-interactive > /tmp/mount 2>&1

/usr/bin/veracrypt is in /etc/sudoers so veracrypt doesn't ask for password. Calling ./mountveracrypt.sh as user works fine. I understand tryveracrypt.sh is run as root, so I'm calling mountveracrypt.sh with su user so the mount is available to user.

If I try:

sudo su
./mountveracrypt.sh
exit (go back to user)
veracrypt -t -l

I get:

Error: No volumes mounted.

But sudo veracrypt -t -l gets:

1: /dev/disk/by-id/usb-AAAAA-0:0-part1 /dev/mapper/veracrypt1 /media/veracrypt1

Ok. Fine. Mounting as root, the volume is only available to root. What is annoying me is when I plug the USB and it runs /udev/rules.d/ script.

cat /tmp/mount:

Volume "/dev/disk/by-id/usb-AAAAA-0:0-part1" has been mounted.

veracrypt -t -l:

Error: No volumes mounted.

sudo veracrypt -t -l:

Error: No volumes mounted.

Why?? I can't access mount as user, not even as root. What am I missing?

EDIT:

I can't dismount the volume with veracrypt -d because veracrypt doesn't see it. I need to reboot the system to unplug.

Does udev/rules run in a different user than root? Although I used whoami and it shows root, and su user -c 'whoami' shows user as expected.

Also, I made a script in udev/rules to mount veracrypt, copy some files and dismount, and it works fine. I just can't access files and dismount veracrypt outside the script called from udev/rules.