If the icon is completely missing & not just hidden.
Right click start & choose run enter
"rundll32.exe shell32.dll,Control_RunDLL hotplug.dll" without the quotes.
Choose a drive to eject, once ejected icon should return.
Step 1. Go to > Settings > Privacy
Step 2. App Permissions > Background Apps.
Toggle ‘Let apps run in the background’ switch to off.
Restart computer. (action center not showing previously or new notifications)
Step 3. Go back to the settings page, previously mentioned in step 1 and 2.
Toggle the ‘Let apps run in the background’ switch to on,
as described in Step 2.
Restart once again.
Action Center is now showing notifications.
As well as the "Safe to remove" pop-up for flash drives without issues.
Information from user Geosammy on the TenForum.
Virginia - Time Lady.
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