I clicked the play button for which I chose my device from Xcode. The simulator launched and showed a representation of my iPhone X device. I looked out my iPhone’s iMessage and swiped across the Sticker and apps selector at the bottom of the screen. Take a look my attachment here. AppIcon has no image.
I swiped to the left and tap the more button at the end of the list. I saw that my app’s AppIcon’s image looks fine and working. But keyboard’s AppIcon doesn’t show an image. I am confused.
I put all the required imessage icons in Assets on the Xcode and double checked that they are sizes are proper as required.