Brake squeal is a known issue.
So try fitting anti-squeal shims if not fitted, or separately supplied in the box plus using a dab of brake grease on the rear of then pads if required, shims should be included in the box or fitted on the pad if u...
I’ve been dealing with this for 8-9 months. My LR dealership cannot hear the noise when they test drive it - because it happens intermittently. Over time it seems to be happening more frequently. Did you get any answers?