I am getting a GraphQL query syntax error on a simple query

Question

I am getting an error code of 42601: "syntax error at or near ")"

The query itself is very simple:

query SimilarJobs { similarityScore(skills: ["KS1203W702ND09XHKJR5"]) { score } }

Here is a screenshot of what's happening:

I don't see a syntax error myself. Is there something simple that I am doing wrong?