Office 2013 Serial Key Valido

One of my Office 2013 installations recently started saying its product key is invalid.

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Background:

I can't find that option in my account library under 'More'. Fe79: In your account library, select the game in question and then click 'More' and 'Serial keys'. Mount and blade warband where to enter serial key free.

I work at a small business. We bought 12 product key cards for Office Professional Plus 2013 from an on-line reseller.

All 12 copies were installed on Windows 7 x64 Professional machines at the end of September 2014.

All machines had previously had Office 2003 Pro installed on them & it was uninstalled before installing 2013.

Recently just one of the machines started saying its product key is invalid.

As the system administrator I went into the uninstall windows, selected 'change' and entered the key again, restarted, and nothing changed. Then I tried doing the online activation from inside Excel & it said the key was invalid & to use phone activation. I tried the phone activation and it said the activation number was wrong & hungup.

The product keys were only ever entered in the computer's local activation dialog. They were never entered online to setup online accounts.

We are using Windows Server 2012 domain controllers with Exchange 2010, if it matters at all.

Help or suggestions would be appreciated.

Thanks,

Office 2013 Serial Key Valido 2015

Matt