I received an email saying:

The customer has asked for a refund because you did not meet the screener requirements stated for this test. If you had not already been paid, you would have been ineligible for payment for this test. Since this reflects poorly on our service, you have been rated 1 star. In the future, carefully read all screener requirements and make sure that you qualify for the test before accepting it. If you complete a test when you don’t meet requirements, it will be a waste of your time as well as the customer’s. If you continue to accept tests that you do not qualify for, we will have to remove you from the Contributor Network. Before you take your next test, please review the following article: “Contributor Code of Conduct”

Oddly, I haven't been able to find this review on the app or on the website in my Test History. All I have to reflect this is the email.

I'm confused. This test was 2 months ago, so I don't even remember what it was about... but how could I have proceeded with the test (which was only $4) if I didn't pass the screener requirements? And it was a canceled test as well. Has this happened to anyone? I'm trying to figure out what I've done wrong so I don't replicate a possible mistake.