Siri can send a message using LinkedIn (please never do this) but can’t add a task to OmniFocus. Ugh. 👎🏻
Sadly, Siri on iOS 10 doesn't support To Do apps like @OmniFocus yet, just 6 other kinds of apps: https://t.co/wKtomdSnT3— Ken Case (@kcase) September 14, 2016
Maybe in iOS 11!