I'm getting the following error when Checking the challenge for the Enable Salesforce Knowledge component of the Knowledge Basics module in Trailhead even though everything is set up correctly according to the article. Knowledge is enabled, the language is set and the user has the appropriate permission. What am I missing?

I'm getting the following error when Checking the challenge for the Enable Salesforce Knowledge component of the Knowledge Basics module in Trailhead even though everything is set up correctly according to the article. Knowledge is enabled, the language is set and the user has the appropriate permission. What am I missing?