Not all stock symbols are recognized, for one thing. And sometimes they're recognized differently by different services. I've encountered that.
One example that I've encountered: BRKB (for the Berkshire Hathaway B class stock) is recognized by my brokerage as BRKB, but STOCKHISTORY in Excel requires BRK-B. You might play around with different ways of expressing AWL.NS....but just be aware it may not be there at all.