Can not find my server

My friend cannot find my server in the LAN, also I he all ready put my 16 ID in the APP, I can also see his ip in the zerotier centeral, and my zerotier one is set for public. What could go wrong. I am using old version of zerotierone for my pc is on win7, my friend is using different version of APP, for his pc is on Win10.

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