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Hi Sophie,
Thanks for answering, however i didn’t receive any communication for deferral by 10 feb 2021, it was only on the 11 feb 2021 i received an email stating that i could still register for a future exam.
May be this was because i didnt schedule the exam though i was registered for the feb exam.
Now, i talked to the institute over phone call, and they suggested that my account was not updated hence the error was appearing at the time of checkout.