Office 365 check installed product key

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Run Command Prompt as adminsitrator
Run this command

c:\>cscript "c:\Program Files (x86)\Microsoft Office\Office16\OSPP.vbs" /dstatus
<code>

  * Check the last 5 characters of the installed product key
  * Remove the product key with this command. Do NOT leave space between "unpkey:" and the product key "XXXXX"
<code>
cscript "C:\Program Files (x86)\Microsoft Office\Office16\OSPP.VBS" /unpkey:XXXXX

Then reinstall the product key

cscript "C:\Program Files (x86)\Microsoft Office\Office16\OSPP.VBS" /inpkey:XXXXX-XXXXX-XXXXX-XXXXX-XXXXX