Thanks for your response. I also thought the same but the last para of the following link tells me that I can take the withdrawal before 31st March of the following year:
Q&A: Can a 529 Reimburse for Last Year’s Expenses? – Marotta On Money
"For this reason, most professionals recommend that you strive to reimburse yourself for qualified expenses during the same year as the expense occurred. If you cannot achieve that, then reimburse before March 31 of the next year as a safe back-up. If you still cannot meet even the March deadline, there has not been an official ruling yet on when a deadline is. This makes it unclear whether you can still reimburse for the expenses and a matter you will have to decide with your tax professional".
