Firebase电话身份验证已停止

Question

我是Firebase和Kotlin的新手。我测试了以下代码以生成OTP号码，但我正在获得Firebase电话身份验证已停止错误并崩溃了该应用程序。我不确定我是否需要FireBase身份验证帐户，以及在哪里需要在代码中传递凭据。感谢您的回复。

graphemes = ["th", "e", "g", "i", "r", "l", "th", "a", "t", "r", "ea", "d", "s"]
graph_nums = {"th":1, "s":2, "t":3}
out_graphemes = [ x for x in (map(graph_nums.get, graphemes, graphemes)) ]
print (out_graphemes)