使用Expo AuthSession API认证Cognito用户时授权码交换失败

最近我在折腾Expo官方的Cognito认证示例代码，目前已经成功获取到授权端点的响应：

request: {"clientId": "<retracted>", "clientSecret": undefined, "codeChallenge": "t6xISsEiAwOIwQxk0Ty1JNo2Kqa53mECL9a7YahLv_A", "codeChallengeMethod": "S256", "codeVerifier": "<retracted>", "extraParams": {}, "prompt": undefined, "redirectUri": "exp://192.168.0.22:19000", "responseType": "code", "scopes": undefined, "state": "o7FeO9ANoa", "url": "https://<retracted>//oauth2/authorize?code_challenge=t6xISsEiAwOIwQxk0Ty1JNo2Kqa53mECL9a7YahLv_A&code_challenge_method=S256&redirect_uri=exp%3A%2F%2F192.168.0.22%3A19000&client_id=<retracted>f&response_type=code&state=o7FeO9ANoa", "usePKCE": true}
 LOG  response: {"authentication": null, "error": null, "errorCode": null, "params": {"code": "<retracted>", "state": "o7FeO9ANoa"}, "type": "success", "url": "exp://192.168.0.22:19000?code=<retracted>&state=o7FeO9ANoa"}

但调用自定义的exchangeFn执行exchangeCodeAsync交换授权码时，直接触发了客户端认证失败的错误：

const exchangeFn = async (exchangeTokenReq) => {
      try {
        const exchangeTokenResponse = await exchangeCodeAsync(
          exchangeTokenReq,
          discoveryDocument
        );
        setAuthTokens(exchangeTokenResponse);
      } catch (error) {
        console.error(error);
      }
    };

具体错误信息如下：

ERROR  [Error: Client authentication failed (e.g., unknown client, no client authentication included, or unsupported authentication method).  The authorization server MAY return an HTTP 401 (Unauthorized) status code to indicate which HTTP authentication schemes are supported.  If the client attempted to authenticate via the "Authorization" request header field, the authorization server MUST respond with an HTTP 401 (Unauthorized) status code and include the "WWW-Authenticate" response header field matching the authentication scheme used by the client.]

应用的完整流程演示动画已提供参考。

内容的提问来源于stack exchange，提问作者Ahamed Abdullah