This issue provides the answer:

https://github.com/expo/expo-cli/issues/1004

As a workaround, you can force a different browser using the BROWSER environment variable.

For me, env BROWSER=firefox expo start works.

For different browsers, use one of the following:

Safari

env BROWSER=safari expo start -w

Firefox

env BROWSER=firefox expo start -w

Chrome

env BROWSER=Google\ Chrome expo start -w

Brave

env BROWSER=Brave\ Browser expo start -w 

Helped me through, despite not being the same problem the use the URL quote helped me solve this by changing a bit how I thought about it!

The final result became a little too big to paste here, but the handling ended up being relatively straightforward:

  useEffect(() => {
    if (result?.type === "success") {
      const { token, iv } = getParamsFromUrl(result.url)

      const session = decrypt(token, key, iv)
      console.log({ session })
    }
  }, [result])