This is a devastatingly serious issue for our business, and I'm sure we're not alone, so a prompt and detailed response would be greatly appreciated. If not, can Microsoft please explain what has changed in Windows Defender ATP Attack Surface Reduction that's caused this issue and how we're supposed to change our code base to prevent ongoing disruptions going forward. Is this a bug in a recent update to Windows Defender ATP Attack Surface Reduction? And if so is Microsoft planning to address this? , but most of our large clients are either taking time to do this, don't know how, or are concerned about creating exemptions. The solution appears to be customizing attack surface reduction rules to create an exemption for our add-in (. - MICROSOFT POWERPOINT ADD-INS - A New Tab that will provide Swap Pasting, Slide Status, Custom Callout storage, Export to PDF, and so. This is a disaster for our business, as our add-in has worked for over 10 years around the world and never been blocked/disabled by Windows Defender before. This appears to be a result of Attack Surface Reduction (see Use attack surface reduction rules to prevent malware infection | Microsoft Docs), and it appears that something has changed in these rules in a recent update which is preventing our Excel add-in (and others we believe too) from working. A recent upgrade to Windows Defender Advanced Threat Protection (ATP) has completely stopped our company's Excel add-in working.
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