I wrote “I’m sorry, I don’t agree” I think that should count as the correct translation
Update: It is now accepted.
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.
How I feel when Duo doesn't accept a valid translation
Can I try "I disagree"?
You go girl. Politics. Or basic human rights.
I do agree