Any elements that you do not want us to cut off in the final product must be 3 - 5mm in from the outer edge of the artwork. This is called a safe inner margin. If your text or logos are in the outer 3 - 5mm of your artwork, the artwork will be reported for risk of element cut off.
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​See the example below where the border is very close to the edge

(The white is the artwork size):

Now, look at a version that leaves enough space all around: Images and background colours can go to the edge of the page, but text and logos must be in the safe area.

Here's how you can fix the risk of element cut-off.