Hello aspirant,
With reference to your above said query, I would like to tell you that your EWS certificate issued on the 16th march, 2021 is not valid in the financial year of 2022 as the EWS certificate is only be valid for every financial year. So, in order to submit your EWS certificate in UPSC exam/registrations , you need to issue a new EWS certificate for the financial year 2022.
However, you can also fill the Undertaking form for EWS certificate available on the official website and can take the admission instantly . Then after 14-17 days you can submit the newly issued EWS certificate in your University.
I hope that it will help.
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