Cantonese (Traditional) still works on the Bing Translator app on a Windows machine (not the web version). Microsoft still needs to fix their web version though.
I saw the same thing happen last month. You should contact the Translator team about this. Last time I contacted them, they emailed me back fairly quickly about my concern.
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This app is missing the Cantonese Traditional. It's misleading b/c it says that Cantonese Traditional is supported but it's only supported on the website and on the phone app.