Unfortunately, huge contrast differences with covered porches, especially one as deep and wide as yours, pose problems to the cameras at long distances. First, it’s a doorbell camera, so it was designed around being able to see and identify who is right at the door, not much further away. So distance vision isn’t a part of the design, though sometimes you can get useful distance video, this isn’t the purpose of the device and you may be expecting more of the device than its design limits allowed. Remember, it’s a doorbell camera, for people at the door. You may be best served with a separate security camera that will cover your yard mounted somewhere not under the porch, rather than relying on a doorbell camera for more than its intended design parameters.
But your case looks a bit extreme, so HDR may be turned off as well, so it’s worth seeing if it’s a simple fix. Make sure the firmware and app is updated and also check the Video Settings tile and ensure HDR is enabled (if you don’t see it, it’s still on old firmware, and calling support would help since they can force a firmware update). With HDR, they’re usually able to manage the contrast differences fairly well, up to a point. Though your situation is very extreme based on the angle of the light, the depth of your porch with how much area you’re expecting to cover, and the reflective siding, so if HDR is currently disabled, enabling it may only help so much.
Also, if that doesn’t help, I’d advise calling support. They have more diagnostics from the video stream, so the can possibly make remote adjustments.