Learn Nano by Building a Castle - Build a Castle

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I have completed the course but the checkmark of completion is missing.

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User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.0.0 Safari/537.36

Challenge: Learn Nano by Building a Castle - Build a Castle

Link to the challenge:

The Relational Database certification is in beta and is not stable.
When you have issues you can try to read and follow this post: