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CFA Institute closed the deadline abruptly without notice around 22nd April, at about the same time as the announcement of postponements for May-2021 in various locations in India.
There’s more info on this thread: https://300hours.com/f/cfa/general/t/august-2021-cfa-exam-window-closed-without-notice/
As to what to do – I don’t think there’s any other choice than to register for November 2021. Sorry dude.