I also got the same error message.
vishwak_blue_cloud_1998
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In IOS 16 simulator, go settings -> Spoken content -> Voices -> Select any language and download. after downloading, test the app. It works for me.
before you get siriLanguageCode(), first you have to request Siri authorisation from the user you. SiriRequestAuthorization - https://developer.apple.com/documentation/sirikit/inpreferences/1829429-requestsiriauthorization.
I found the answer. First you have to get siri authorization from the user.
I tried but no luck