While running `su - <username>` with root credentials, getting the error `su: /bin/bash: Permission denied`

Issue

• The superuser root is not able to switch to the newly added users.
• Only the users which are part of root as their secondary group can get the shell.
• There is no changes in pam done.
• The shell available for the newly added users is /bin/bash
• Following is the example of the issue.

# useradd -u 1000 test
# passwd test
Changing password for user test.
New UNIX password:
Retype new UNIX password:
passwd: all authentication tokens updated successfully.
# su - test
su: /bin/bash: Permission denied