Hello Purushottam,
Please let us know if this for Ignite 2020 or Ignite 2021 to isolate your issue.
If this for Ignite 2021, we’ve been receiving a lot of reports regarding the claiming of discount earned through Microsoft Ignite 2021 event.
This has been forwarded to our Engineering Team and have confirmed that is now resolved.
Before trying to claim your discount again, please try the troubleshooting steps below:
Make sure you have the latest browser (Edge/Chrome/IE or Mozilla Firefox)
Try using your browser in InPrivate/Incognito
Clear browser cache and cookies
Allow all cookies/third party cookies on your browser settings
Sign back in to your Microsoft Certification profile and try to update/schedule your exam.
Also, please make sure to enter the email address on the Check Eligibility field on small caps.
If the above steps do not resolve your issue, please provide us with a PSR (Problem Steps Recorder) from the troubleshooting steps until the error message via private message along with the requested information so we may continue troubleshooting with you.
You may also adjust the limit of 25 screenshots as a default to a higher number of pictures to show the process. Please change the number to at least 100 screenshots in the tool’s settings.
To access private message, please see image below:

Also, in the private message, please attach the actual confirmation/congratulatory email you received after completing the event showing your email address on the recipient field.
I look forward to your response. Please note that if no response is received after two business days, the case will be closed and locked. After the case is locked, we will no longer be able to respond, even through Private Messages.
Best regards,