My sync code and IP are both offline

I cannot sync to other device ,how can i online my sync code

You’re going to have to share more information with us. What tablets are you using? What kind of network are you using? Have you used this network before?.
The more information you can give us the better off we are with helping.

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Using an iphone XR ,first time to try using ang cp to be the main ,my ipad have its sync code ,i can transfer data from tablet to iphone but cannot bu iPhone to tablet