出现Alexa设备地址API问题通常是由于在获取设备地址时，返回的是null值或错误值。为了解决这个问题，可以参考以下示例代码：

const Alexa = require('ask-sdk-core');
const RequestEnvelope = Alexa.getRequestEnvelope(request);
const { deviceId } = RequestEnvelope.context.System.device;
const { apiEndpoint } = RequestEnvelope.context.System;

if (!deviceId) {
    throw new Error('Unable to get Device ID');
}

if (!apiEndpoint) {
    throw new Error('Unable to get API endpoint');
}

const deviceAddressServiceClient = new Alexa.services.DeviceAddressService(deviceId, apiEndpoint);

const addressAPI = {
  country: '',
  postalCode: '',
  state: '',
  city: '',
  addressLine1: '',
  addressLine2: '',
  addressLine3: ''
};

const consentToken = RequestEnvelope.context.System.apiAccessToken;

console.log(`user's apiAccessToken is ${consentToken}`);

return deviceAddressServiceClient.getFullAddress(deviceId, consentToken)
  .then((data) => {
    console.log(data);
    const address = data.addressLine1 + data.addressLine2 + data.addressLine3 + '，' + data.city + '，' + data.state + '，' + data.postalCode + '，' + data.country;
    return addressAPI = {
      country: data.countryCode,
      postalCode: data.postalCode,
      state: data.stateOrRegion,
      city: data.city,
      addressLine1: data.addressLine1,
      addressLine2: data.addressLine2,
      addressLine3: data.addressLine3
    };
  })
  .catch((error) => {
    console.error(error);

    if (error.statusCode === 403) {
      throw new Error('Unauthorized request');
    } else if (error.statusCode === 405) {
      throw new Error('Address Permission not granted');
    } else {
      throw new Error('Unable to retrieve device address');
    }
  });

在代码中，我们首先获取了设备ID和API端点，然后使用这些信息进行地址服务的客户端初始化。接着，我们调用getFullAddress函数获取地址。最后，根据获取到的地址信息，我们返回了一个包含多个地址字段的JSON对象。