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Joined June 2017
As per the provisions of income tax, TDS needs to be done on payment or credit which ever is earlier.
Hence you cannot deduct TDS for 2019-20 now.
You only have two alternatives now,
1. You can obtain a certificate from payee in prescribed form that payee have paid income tax.
2. Assume that the payment made is net amount and now pay tax along with interest and late fee.