cannot receive display notification on s6 edge+

[Lovefortmobile]

What would be the reason only 1 number won't show up in the notification panel when getting a sms? Can get the preview notification for all numbers expect one. Does it matter that the other number is also an s6 edge+? Is there a way to get the notification preview for a specific number?

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[the tall guy]

Hi, so you are receiving notifications fine, with the exception of one contact, who also owns a S6 edge? what messaging app are you both using?