Tata Consultancy Services — Unable to update password on Alumni Portal

Address:

A-44-45, Block A, Industrial Area, Sector 62, Noida, Uttar Pradesh 201309

I am trying to log in at https://www.alumniportal.tcs.com. I'm already a registered user but I had forgotten my password. So I tried generating a new one. When I clicked on forget the password, I received an email with a temporary password.
Though I was able to log in using this temporary password, I was asked to generate a new password. However, I have tried several combinations of passwords that fulfil the password policy but I'm still getting the below error.

"Please enter Password with minimum of one small character, one capital character, one numeric value, one special character"