*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.
I created a second standard account, and Windows Defender Security Center says "Actions Recommended." When I open it, Security at a glance shows all icons green.
On my (administrative) account, it says "no actions needed."
I have Norton Antivirus installed.
Shane.
I found my issue, maybe it will help others. Go into the security center / click on the Shield (left side) Virus and Threat Protection. Look for Ransomware protection. I had a message about setting up OneDrive for file recovery in case of a ransomware attack. I dismissed the alert.
More info on why you might or might not want to set this up:
This really worked thanx man!!!
This was it, thank you! I temporarily enabled periodic scan, dismiss this OneDrive suggestion, and disable periodic scan again. And it goes back to green checkmark. This behavior appears more as a bug for me than a feature. Windows should not force people to visit this RansomWare option if periodic scan is turned off by external virus protection software.
I did this as well, and the warning sign does goes away (for a while) and then returns. Microsoft need to apply a permanent fix. :( I agree it is annoying to see this notification, and I worry that there may be something I really need to worry about!!