Push Notifications are not received on Defender Soft Token Apps for Android or iOS (4379768)

Defender Security Server is not able to send Push Notifications or retrieve the response back from the Defender Soft Token App on Android or iOS.

This issue affects Defender Security Server release versions 6.6 or older running on Windows Server 2012, 2016, 2019 or 2022.

Enforcing TLS 1.2 at both the OS level (on Windows Server 2012, 2016, 2019 or 2022)  and .NET Framework level via registry changes allows the push notifications to be sent to Defender Soft Token App but DSS does not receive a response back

On Windows Server 2025, push notifications are sent to the Defender Soft Token App on Android or iOS but DSS does not receive a response back.

Google Auth API deprecated default use of TLS1.0 and TLS1.1 with Windows Server 2012, 2016, 2019 and 2022.

STATUS:

Change Request # 497049 was raised to investigate and address this issue.