If you search for alignment on the forum, you’ll find lots of posts about it, including many with the standard reply from support telling you what to check. Here’s one: Another Glowforge With Alignment Issues
As far as I’m concerned, the salient points to keep in mind are that tiny changes in material height make a huge difference in alignment, so make sure you’re measuring accurately, it’s not warped, etc. The further you are from the center of the bed, the worse it’s going to be, so if possible try to center things under the camera. And last but most, camera alignment is never going to be perfect on these machines. If it’s less than 1/4" off, it’s within specifications. If it’s more than that and you can prove it with Proofgrade and the Gift of Good Measure, maaaaaybe you’ll get your Glowforge replaced. But realistically, get used to making jigs for anything that requires precision.