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Could be any number of reasons. Here's 33 to check:
Missing Something in a Revit View? 33 Steps to Find Stuff | Ideate Inc
...basically, it means exactly what it says. The element you are placing is not visible within the view. It's there in the Project/Family, but the View you're in doesn't capture it. Typically, it's a View Range thing.
...actually, my guess it that the Category is hidden. You probably Temporarily hid Elements by Category.
Yes.
It's usually for one of the reasons stated in the message.
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