---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/53121#article
headline: "53121: Approaching room or participant concurrency quota"
url: https://www.twilio.com/docs/api/errors/53121
inLanguage: en
dateModified: 2026-03-11T20:43:38.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 53121: Approaching room or participant concurrency quota

Log Type: APPLICATION

Log Level: WARNING

## Description

#### 53121: Reached 70% of room or participant concurrency quota

### Possible causes

* Connecting the first Participant in an Ad-hoc Room might exceed the account's concurrent Rooms quota.
* Creating a Room via the REST API might exceed the account's concurrent Rooms quota.

### Possible solutions

* Complete existing Rooms.
* Contact support/sales to increase the concurrent Rooms quota for your account.