Wait no.
The lobby background is fine as it’s the same one we have active now, I think I am being hit for the Landscape Thumbnail and Square Thumbnail only.
It states: “You can include the game name, but be aware that it will also show under the image in Discover.” from Thumbnail Image Guidelines for Discover
Unless I’m reading that wrong, that should be fine.
Could it be the background/ patterns? Again I see a few examples on the discovery page of Fortnite that have all kinds of thumbnails for the same kind of tycoon game and I do not want to follow the “level 0 - level 999” thumbnail meta.
Cheers.