I just bought a new computer and authorized it according to instructions, however the new unit does not show up on the authorized devices list and my iPad won't attach. Any thoughts?

I just bought a new computer and authorized it according to instructions. However, it does not show up on the authorized devices list and my iPad won't connect through it.   The iPad and the original computer are still listed as the only authorized devices.  Any ideas on how to fix this?  Thanks.

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