HP Stream Mini 300-020

I purchased a HP Stream Mini 300-020 to run some TV presentations with.  I upgraded it to Windows Pro 8.1, but I am having a problem getting the windows to activate.  When I type in "slui 4" it says it cannot be activated by phone, but it is telling the Product Number does not work, but I have checked with MS and the number is good.  Does anyone have a clue why I am having this problem and how I can solve it?
Bill2802AV/IT TechAsked:
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David Johnson, CD, MVPOwnerCommented:
I upgraded it to Windows Pro 8.1 What procedure did you use to do this? Is the Pro an oem or retail version? did you use the any-time upgrade option?
Bill2802AV/IT TechAuthor Commented:
I used volume license through MS.  I downloaded the upgrade and placed on a disc.  Installed from the disc.  No problem with the installation.  Just when I go to change the product key to activate it, I get the message the product key is not working.  I called MS and they agreed the product key is good, but the phone goes dead after they figure out they cannot not fix it.
Bill2802AV/IT TechAuthor Commented:
I found the problem was our firewall.  The firewall was not letting the computer communicate with the volume license server.  Once I figure that out, I was able to allow it to communicate and everything worked great.

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Bill2802AV/IT TechAuthor Commented:
I figured out the solution.
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Windows 8

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