Good question. Them light over an icon on an app showing you to open it
For example, when an upgrade is avail even, there will be a little light on the setting app. This is the same thing.
I have a titificstion light on my settings app. When I open it, it leads me to iCloud and tells me I have to approve terms and conditions. I do that, but the light stays on. I even get warned when I turn on phone that iCloud will not work unless I accep terms and conditions.
However, iCloud works fine. Thanks for responding to this. I just upgraded X to 11.2.1 and it still does it.