I came here wondering the same thing. I have a possible solution, but I'm not sure if my idea is would work.
I have a discussion where students need to post and reply to at least 2 other posts.
In the module settings, I have the task set to "Contribute to page"
In the discussion settings, I've turned on the option for "Users must post before seeing replies"
That way, in order to Contribute, they must post first to see the discussion threads, and then they can reply to 2 others, and the module task will be marked complete.
Does anyone see any issues with this? One thing is that the task will be marked as done if they only reply to 1 other, but I think I can make that clear on the discussion description that they must reply to two others. I'm just thinking if no one is suggesting this, this might not be a valid solution for a reason I might be missing.
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