Solved GROUPS, FACL, TOUCH

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STEP 1: Three users are made by user "kali" named - "anmol", "sehaj", "prachi".
STEP 2: One group was made by user "kali" named - "C"
STEP 3: ALL three users are put in the C group, - "anmol" , "sehaj", "prachi".
STEP 4: Made one directory named "C" by "kali"
STEP 5: setfacl -m d:g:C:rwx C
STEP 6: chmod g+t C
STEP 7: su anmol
STEP 8: newgrp C //or I did change primary group of ANMOL by kali using sudo
STEP 9: touch anmol.txt
---PERMISSION DENIED---
WHY ?????????????????????

IF ANMOL IS IN GROUP "C" and I give all access to group C then why he can't make anything ? even after changing explicitly it's primary group from anmol to C

What distro are you running? My first thought is that AppArmor or SELinux may be preventing preventing file creation. Let me know what distribution you are running and I will test out your steps to see what is blocking it.

@Don-Pezet Sir, it's Kali linux latest version , arm build in raspberry pi 4.
Thank You for your reply.

OK, I recreated your steps in Kali and tracked down the problem. You set the default permissions for the group default:group:C:rwx as opposed to specific permissions for the group group:C:rwx. Most distros (including Kali) ignore the specific group defaults and only use the generic group default default:group::r-x.

Run the following command to set the actual permissions for the "C" group:

setfacl -m g:C:rwx C

Notice how I left off the d: part. That will result in the following permissions:

┌──(anmol㉿kali)-[/home/kali]
└─$ getfacl C
# file: C
# owner: kali
# group: kali
user::rwx
group::r-x
group:C:rwx
mask::rwx
other::r-x
default:user::rwx
default:group::r-x
default:mask::rwx
default:other::r-x

Once that is set, the users in group C will be able to write files to the folder.

@Don-Pezet Thank You so much sir, for your help. I m really blessed to connect with you and sorry if I made any inconvineince to you. You are really a great teacher.
Thank you once again.