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Outage in Twilio

Flex Ui 2.15 Token Refresh Issue Calls Dropping

Resolved Minor
December 11, 2025 - Started 4 months ago - Lasted 4 days
Official incident page

Incident Report

We are investigating a high impact bug with Flex UI 2.15 where the Flex Token does not refresh before expiration, causing Voice SDK errors and Twilsock issues. This results in: Calls dropping, audio may fail, call controls become unresponsive, and agents may not receive calls. We expect to provide another update in 1 hour or as soon as more information becomes available.
Components affected
Twilio Flex Application Platform

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Latest Updates ( sorted recent to last )
RESOLVED 4 months ago - at 12/15/2025 04:41PM

Our engineers have implemented a fix for the high impact bug with Flex UI 2.15. A new patch has been released, and the customers should not encounter any other errors.

MONITORING 4 months ago - at 12/15/2025 02:21PM

Our engineers have implemented a fix for the high impact bug with Flex UI 2.15. A new patch has been released, and the customers should not encounter any other errors. We expect to provide another update in 2 hours, or as soon as more information becomes available.

IDENTIFIED 4 months ago - at 12/15/2025 05:38AM

Our engineers are continuing to work on a fix for the high impact bug with Flex UI 2.15. Flex customers should avoid upgrading to Flex UI 2.15 until resolved. We expect to provide another update in 24 hours, or as soon as more information becomes available.

IDENTIFIED 4 months ago - at 12/14/2025 05:38AM

Our engineers are continuing to work on a fix for the high impact bug with Flex UI 2.15. Flex customers should avoid upgrading to Flex UI 2.15 until resolved. We expect to provide another update in 24 hours, or as soon as more information becomes available.

IDENTIFIED 4 months ago - at 12/13/2025 05:38AM

Our engineers are continuing to work on a fix for the high impact bug with Flex UI 2.15. Flex customers should avoid upgrading to Flex UI 2.15 until resolved. We expect to provide another update in 24 hours, or as soon as more information becomes available.

IDENTIFIED 4 months ago - at 12/12/2025 01:29PM

Our engineers are continuing to work on a fix for the high impact bug with Flex UI 2.15. Flex customers should avoid upgrading to Flex UI 2.15 until resolved. We expect to provide another update in 16 hours, or as soon as more information becomes available.

IDENTIFIED 4 months ago - at 12/12/2025 04:37AM

Our engineers are continuing to work on a fix for the high impact bug with Flex UI 2.15. Flex customers should avoid upgrading to Flex UI 2.15 until resolved. We expect to provide another update in 8 hours, or as soon as more information becomes available.

IDENTIFIED 4 months ago - at 12/12/2025 12:37AM

Our engineers are continuing to work on a fix for the high impact bug with Flex UI 2.15. Flex customers should avoid upgrading to Flex UI 2.15 until resolved. We expect to provide another update in 4 hours, or as soon as more information becomes available.

IDENTIFIED 4 months ago - at 12/11/2025 10:37PM

Our engineers are continuing to work on a fix for the high impact bug with Flex UI 2.15. Flex customers should avoid upgrading to Flex UI 2.15 until resolved. We expect to provide another update in 2 hours, or as soon as more information becomes available.

IDENTIFIED 4 months ago - at 12/11/2025 09:37PM

Our engineers have identified a high impact bug with Flex UI 2.15 where the Flex Token does not refresh before expiration, causing Voice SDK errors and Twilsock issues. This results in: Calls dropping, audio may fail, call controls become unresponsive, and agents may not receive calls. We are actively working on a fix. Flex customers should avoid upgrading to Flex UI 2.15 until resolved. We expect to provide another update in 1 hour or as soon as more information becomes available.

INVESTIGATING 4 months ago - at 12/11/2025 09:10PM

We are investigating a high impact bug with Flex UI 2.15 where the Flex Token does not refresh before expiration, causing Voice SDK errors and Twilsock issues. This results in: Calls dropping, audio may fail, call controls become unresponsive, and agents may not receive calls. We expect to provide another update in 1 hour or as soon as more information becomes available.

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