I accidentally went off the stream, can I use the same code to get back on?

As long as you're on the same device, with the same IP address, you can use the same code to get back on to the live stream.
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Note that using Private browsing or Incognito mode in your web browser can cause issues if you reload the page and your IP address has changed. It is advised to not use this functionality within your web browser for a smoother experience.