Grey Bars in ScreenTime
Seen this asked a few times, but still cannot find a definite answer from Apple.
This is a big problem for parents when trying to control kids. The main reason why Screen Time was designed and released in the first place!
From my research all I can say it is either time spent on FaceTime as this category isn't shown (but maybe come under "Messages") or is when the phone is sat active with the screen on with any interaction from the user. However sometimes I see periods of up to 45minutes when my daughters Screen Time shows grey.
Also her "Other" section is shown as ORANGE.
Now here is what I have just noticed since writing the above on my laptop. I've had my iphone unlocked in the Settings menu looking at my Screen Time. This time has been recorded as GREY lines, but my ORANGE section is now called "Productivity" and not "Other". The category for "Settings" shows 25mins which corresponds to the graph. SO I AM STILL CONFUSED and WOULD LIKE AN ANSWER.