How allow folder permission for another user in Linux

Question

Consider two user accounts user1 and user2 on one Linux machine. I want user2 to be able to have read and write access to a folder in user1 home directory.

So far created a group for both users and added both users

groupadd twousers
usermod -a -G twousers user1
usermod -a -G twousers user2

then changed the group and the path and changed the permission

chgrp twousers /home/user1/folder
chmod g+rwx /home/user1/folder

Unfortunately user2 is still unable to access the folder /home/user1/folder . It seems to be quite simple but somehow I am lost. What am I missing?

Answer 1

chown user1.twousers /home/user1/folder

chmod 775 /home/user1/folder

Answer 2

请尝试以下操作，直到获得许可，并确保您不弄乱文件或文件夹的路径或名称：

chmod u+rwX,g+rwX,o+rwX