*SOLVED*
Log into your microsoft account and under Devices section you can see the details why this warning sign occurs.
You need to signed in with you microsoft account to do so.
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I have been using Windows Defender for years, and Microsoft Security Essentials before that. I haven't had any problems with either one-- but in the last day or two the Windows Defender icon in my system tray has been showing a yellow caution sign on it, and if I hover my mouse pointer over the icon it says "Actions recommended." However, when I open Windows Defender everything shows a green check and says "No action needed." How can I find out what is causing the yellow caution sign? All Windows updates have been downloaded and applied, the Windows Defender is up to date. and the last scan (which was done automatically after the caution sign appeared) shows no threats found.
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*SOLVED*
Log into your microsoft account and under Devices section you can see the details why this warning sign occurs.
You need to signed in with you microsoft account to do so.
All I did was change "Real-time protection" to "Off", then back to "On". The notification icon first changed to having a red x and then to the green checkmark. Problem solved.
I've spent months on this problem. This finally worked for me ...
I thank you! I had the very same issue and your solution work perfect!
*SOLVED*
Log into your microsoft account and under Devices section you can see the details why this warning sign occurs.
You need to signed in with you microsoft account to do so.
This is the real answer. However, it tells me to enable BitLocker. I'm using "HOME" which doesn't even have BitLocker as an option.
Disabling real-time protection and then re-enabling it has cleared it up. For now.