---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/38001#article
headline: "38001: Teams: Unassigned To number"
url: https://www.twilio.com/docs/api/errors/38001
inLanguage: en
dateModified: 2026-08-04T20:07:40.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 38001: Teams: Unassigned To number

Log Type: APPLICATION

Log Level: ERROR

## Description

The outbound call to a Teams number fails because the destination number is provisioned but not assigned to a user yet.

### Possible causes

* The destination Teams number is not assigned to a user.

### Possible solutions

* Ask your Teams admin whether the number is assigned to a user.