Bumpy ride at 20-40 mph

[FarmerDylan]

Hey all. I’m new here. I just bought a used 2022 outback. 27k on the odometer. I’ve noticed this strange issue where when I drive it bumps like I’m going over little bumps. At around 20-40 mph it’s the most noticeable and super frustrating but gets a little better as I drive but still noticeable. I brought it to the dealership and they ran a full diagnostic before telling me they feel it and they think it’s the new tires that need to be “broken in”? I’ve never experienced this with any other cars. So I’ve driven it a few hundred more miles and still no change. Does anyone know what the heck could actually be causing this?