Undefined is not an object (evaluating '_PushTokenManager.default.getDevicePushTokenAsync [REACT NATIVE EXPO]

Question

Can't get the token with the getExpoPushTokenAsync() function on expo-notifications api. The function as follow is just identical to Expo documentation:

import Constants from "expo-constants";
import * as Notifications from "expo-notifications";
import * as Permissions from "expo-permissions";

async function registerForPushNotificationsAsync() {
    let token;
    if (Constants.isDevice) {
    const { status: existingStatus } = await Permissions.getAsync(Permissions.NOTIFICATIONS);
    let finalStatus = existingStatus;
    if (existingStatus !== 'granted') {
        const { status } = await Permissions.askAsync(Permissions.NOTIFICATIONS);
        finalStatus = status;
    }
    if (finalStatus !== 'granted') {
        alert('Failed to get push token for push notification!');
        return;
    }
    token = (await Notifications.getExpoPushTokenAsync()).data;
    console.log(token);
    } else {
        alert('Must use physical device for Push Notifications');
    }

    if (Platform.OS === 'android') {
    Notifications.setNotificationChannelAsync('default', {
        name: 'default',
        importance: Notifications.AndroidImportance.MAX,
        vibrationPattern: [0, 250, 250, 250],
        lightColor: '#FF231F7C',
    });
    }

    return token;
}

Expo: ~37.0.3 App.json:

"expo": {
        "android": {
          "useNextNotificationsApi": true
        }
      }

Seems like when calling the function, got the next warning:

[Unhandled promise rejection: TypeError: undefined is not an object (evaluating '_PushTokenManager.default.getDevicePushTokenAsync')]

Answer 1

Make sure you import {Notifications} from 'expo' and not the other way from 'expo-notifications'. Was having the same problem but then tried importing it from the 'expo' and it worked. Check out this image

Answer 2

make sure you are in managed workflow, if you are in bare you should specify { experienceId}

code example from the docs:

    import Constants from 'expo-constants';
import * as Notifications from 'expo-notifications';

export async function registerForPushNotificationsAsync(userId: string) {
  let experienceId = undefined;
  if (!Constants.manifest) {
    // Absence of the manifest means we're in bare workflow
    experienceId = '@username/example';
  }
  const expoPushToken = await Notifications.getExpoPushTokenAsync({
    experienceId,
  });
  await fetch('https://example.com/', {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
    },
    body: JSON.stringify({
      userId,
      expoPushToken,
    }),
  });
}

experienceId (string) -- The ID of the experience to which the token should be attributed. Defaults to Constants.manifest.id exposed by expo-constants. In the bare workflow, you must provide a value which takes the shape @username/projectSlug, where username is the Expo account that the project is associated with, and projectSlug is your slug from app.json

for more info: https://docs.expo.io/versions/latest/sdk/notifications/#dailytriggerinput