Tata Consultancy Services — Unable to register and access the alumni portal

I am a ex-employee of TCS.i have served my notice period in October 2022.i have tried to register to alumni portal but it showed registration failed also after that I was unable to access the link for the same.i have raised the ticket for this issue for more than a week but haven't received any response yet.(ticket:963724).Also there is no contact details available to reach out regarding same issue.kindly check with the issue urgently.