Brother try using the command:-
chmod 777 /tmp/xfusioncorp.sh
If in case the chmod 777 doesn’t work, maybe you should use the ACL linux permissions. If that’s your case, then you should redefine the ACL in the script, allowing every user to be able to run it (Which is the same as you made with your chmod command, I know). If you think the lab is buggy, after doing what Yash suggested, then maybe you should try the ACL idea, also combined with you chmod in first instance, and in the last case with Yash chmod. The users could be know by using the command users, but In this case I suggest to get it know by reading the /etc/passwd, there you should be able to see all the users in the Linux machine. That’s is my troubleshooting idea, hope it helps.
Let us know if your succed or not.
Have a nice day