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headline: "22108: Invalid Application SID"
url: https://www.twilio.com/docs/api/errors/22108
inLanguage: en
dateModified: 2026-03-11T18:38:39.000Z
author:
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  name: Twilio Developer Education Team
publisher:
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  name: Twilio
---

# 22108: Invalid Application SID

Log Level: ERROR

## Description

You attempted to configure a phone number with an invalid Application SID.

### Possible causes

* The SID is not a 34-character string that is prefixed with "AP".
* Invalid SMS Application SID provided in request
* Invalid Voice Application SID provided in request
* The Application resource identified by the SID does not exist anymore or does not belong to your account.

### Possible solutions

Please specify an Application SID you've created in your [Account Dashboard](https://www.twilio.com/user/account/apps).