Need help with this goat yogurt question

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I needed more goat milk to make another batch of yogurt. I went to 2

different stores but no one had any. The second store said that this

time of year, the goats don't give any milk. Anyway, I found some in

the section of the grocery store that has the soy milk, almond milk,

rice milk, etc. The non-refrigerated section. I used this goat milk

to make yogurt but it didn't solidify. Can I still use this yogurt

or shall I throw it out and try the powdered goat milk to make the

yogurt?

This goat milk contained goat milk and vitamin D3.

Please advise. My son really needs this yogurt. He get an itchy

butt when he doesn't get his yogurt and we are OUT!