Congratulate sb on (doing) sth: ‘The President congratulates the crew on the success of their mission.’ ‘They congratulate him on his marriage.’
‘Congratulations’ is a plural noun: ‘Many congratulations to you both. I’m sure you’ll be very happy together.’ ‘Convey our congratulations to them and say that we’ll be getting in touch soon.’
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Congratulations on (doing) sth (NOT for): ‘Congratulations on your promotion. You certainly deserve it.’