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A few things stand out here to me, so I have some questions. Is your friend an experienced hatcher? If so, maybe there's a problem with your parent birds. A deficiency in the diet, or a lethal gene? A dietary problem can cause a low hatch/survival rate. Did the first eggs have poor fertility? You didn't say how many were fertile out of how many eggs total. Sometimes, if it's a first breeding season, it takes the birds a while to get the hang of it, and make good contact when they mate.
Did the incubator warm up properly and get stable before you set the eggs? Did you fiddle with it a lot? Did the eggs get cold when they were moved from mom to the 'bator?
What temp did you use, and did you monitor humidity, or add water at any point?
It's not unusual to have a poor hatch on your first try. Like many things, it can take awhile to get the hang of it. If everybody gave up after one unsuccessful attempt at everything they tried, hardly anybody would accomplish anything.
I'd read up on the basics of hatching, and read up on the dietary needs of breeding turkeys, (adding things like wheat germ oil, or cod liver oil, has been recommended) and give it another try. If it's too late for this year, then try again in the spring, when they lay again.
ETA: If you have a broody chicken, they're really good at hatching and raising turkeys. You just have to make sure she doesn't have too many eggs to keep them properly warm.