Smart App Banner not appearing

I'm trying to set up a smart app banner for my app, but it doesn't appear on the website when I try to test it.

I have the meta tag on my website:

<meta name="apple-itunes-app" content="app-id=6740216045" />

When I inspect the website, I can see that the meta tag is showing up in the head, but the banner is nowhere to be found. I tried clearing website data but still no dice.

Smart App Banner not appearing
 
 
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