# 52002: Invalid Credential Sid

Log Level: ERROR

## Description

In order to send push notifications to iOS and Android devices you need to configure a Credential that allows Twilio to send notifications to your app.

You can configure these at different places depending on which Twilio product you use:

* Chat: Configure in access token
* Notify: Configure default Credential in Notify Service or Binding specific one in Binding
* Voice SDK: Configure in access token

### Possible causes

* Credential SID is not configured correctly

### Possible solutions

* If using Chat include Credential SID in access token. Check out this [guide](/docs/chat/ios/push-notifications-ios)
* If using Notify, either configure default Credential SID in your [Service](https://www.twilio.com/console/notify/services) or provide the Credential SID in the [Create Binding](/docs/notify/api/binding-resource#create-a-binding) request
* If using Voice SDK, include Credential SID in access token. Check out our [documentation](/docs/voice/sdks) for details