Why aren't these working?

I was trying to contact the seller but don't see that option. I sat these out in the sun today & wrapped around my dogwood tree. That took a while due to the length & got tangled a few times. I couldn't wait until it got dark but lights didn't come on. I pushed the on/off button a few times since you can't tell if it's on or off. Still not working. I saw such good reviews so not sure what went wrong.

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