I wrote “I’m sorry, I don’t agree” I think that should count as the correct translation
Since 'don't' is a contraction for 'do not' I definitely agree it should also be accepted.
But I've found that duolingo doesn't generally like/use contractions.
Update: It is now accepted.
You go girl. Politics. Or basic human rights.
Maaf, saya ada setuju.
if you agree, saying "Saya setuju" would suffice.
I do agree