In this sentence, what could be added to say that the result was contrary to the person's intent/expectation?
The meeting was planned to show that the board value employees’ opinions, but (it) _______ .
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to have the reverse of the desired or expected effect
their plans backfired
(Cambridge dictionary) counterproductive adjective uk /ˌkaʊn.tə.prəˈdʌk.tɪv/ us /ˌkaʊn.t̬ɚ.prəˈdʌk.tɪv/
having an effect that is opposite to the one intended or wanted:
- Improved safety measures in cars can be counterproductive as they encourage people to drive faster.
off the correct or expected course : AMISS
- Their plans went awry. (M-W)
You could modify outcome with an adjective like suprise; this is in fact the example given by Merriam-Webster:
something that follows as a result or consequence
a surprising outcome