Same LTI URL, two courses, one works, the other "couldn't find valid settings for this link"

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I've seen other posts where they entered a bad URL, but I have a situation where it's the exact same URL to an external tool. The URL includes a resource-ID like https://server/lti/test?id=123 and the Developer Key for the app is configured at the account. It also shows up in the Settings -> Apps -> View App Configurations of both courses as expected. I entered the same URL into an external tool assignment in two different courses, both under that account. And in one course, the link works fine. In the other, it says it "couldn't find valid settings for this link". I'm perplexed.