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I'm trying to complete the Trailhead "Automate Case Management". I'm logged into my Developer Org and when I clicked Check Challenge, it took some time, but then told me that I had earned 0 points! Did something change? Is it an all or nothing approach?
Mine did this too for Testing Apex Triggers, says the challenge is complete but hasnt marked it so with a green check, and gave me a big, fat +0 points.

Yeah, I got no green check mark either.

They should give you another shot at the challenges that make you connect to the org. With multiple choice they give you partial credit...