Wipro — Not able to sign up Wipro Alumni portal with personal email id

My last working day in Wipro was 17/11/2022 and my employee id is 20094834. I have been trying to sign up in Wipro Alumni portal but I am not able to add my personal email id at the time of sign up after verifying all details. My wipro email id is auto-populating and I cannot edit it and the sign up button is also greyed out. I am not able to view my final settlement details and if amount I paid is received or not.