I have good news and bad news for you. The good news is that your solution works from my end. The bad news is that you have to try the methods below until one works for you. (Let me know if you need any clarification on these steps)
Click on the “Restart Step” button and force a refresh of your page with CTRL-F5 then try to paste the code in again.
or - Try the step in incognito or private mode.
or - Disable any/all extensions that interface with the freeCodeCamp website (such as Dark Mode, Ad Blockers, or Spellcheckers), and set your browser zoom level to 100%. Both of these factors can cause tests to fail erroneously.
or - Ensure your browser is up-to-date or try a different browser.
I hope one of these will work for you.