Microsoft Defender Accessibility Service on Android

Question

Why does this service keep turning itself off when there is no other software that I am aware of that would cause interference?

I have done all this:

• In device Settings, open the Battery / Power / App battery usage section (name varies by vendor).
• Set Microsoft Defender to Unrestricted or Don’t optimize / No restrictions.
• Ensure Allow background activity / Run in background / similar is enabled for Microsoft Defender.
• Make sure any “put unused apps to sleep” or “app quick freeze” lists do not include Microsoft Defender.

What other app could be using the Accessibility Service for the same type of protection?

Answer 1

Hi Brian,

Based on what you've already done, you've covered the most common causes related to battery optimization and background process management.

Regarding your question about what other applications could interfere with Microsoft Defender's Accessibility Service, any app that uses Android's Accessibility API could potentially contribute to conflicts or cause Android to reevaluate accessibility permissions. Examples include:

• Password managers (Bitwarden, LastPass, 1Password, Keeper, etc.)
• Banking and financial security apps
• Other antivirus or mobile security products
• Device management (MDM) applications
• Automation tools such as Tasker or MacroDroid
• Accessibility-focused apps such as screen readers, click assistants, or gesture tools

Even though Android generally supports multiple accessibility services running simultaneously, some device manufacturers implement additional restrictions that can cause services to be disabled unexpectedly. This is particularly common on devices with heavily customized Android implementations. Microsoft Defender itself is not typically expected to disable its Accessibility Service without an external trigger or an application/service issue.

It is also important to note that Android battery optimization behavior is highly dependent on the device manufacturer. While Android provides standard battery optimization settings, many manufacturers implement additional power-saving mechanisms at the system level that go beyond the settings exposed through the Android user interface. These vendor-specific features may automatically restrict background processes, disable accessibility services, or suspend security-related functions in an effort to conserve battery life.

As a result, the steps required to keep an Accessibility Service active can vary significantly between manufacturers and even between device models. If the issue persists after applying all available Android battery optimization exclusions, we recommend contacting the device manufacturer's support team for guidance on any additional battery management, application protection, or system-level power-saving settings that may affect Accessibility Services on the specific device.

I hope that this information is helpful to you.