Why can't I sign in?

Why can't I sign in?

I have tried to change my password 3 times but every time I try to sign in, it says the password is wrong!

No, I am not using CAPSLOCK or the wrong upper/lower case. I have tried to change the password 3 times but each time I type in the new one it says 'password invalid'.

This is relating to the email address university.relations@internindia.co.uk

Please help if possible!