Step One: Sign out from all your Office 365 applications. Here is what they advised me to do – and it fixed it! Below you will find the solution. I decided to reach out to Microsoft about this issue. I was at the end of my troubleshooting rope. 0x80041015 Partial Pkey=M7TW3″ I looked online for help with this error but I came up empty. ” Installation of the Proof of Purchase failed. I also checked Event Viewer for clues, and I found this. Logged into Windows 10 in Safe Mode to activate Office 2016.This different computer activated just fine! So I knew it was a computer issue, not an Office 365 account problem. I downloaded and installed Office 2016 from his Office 365 account on another computer.Upgraded computer from Windows 8 to Windows 10.Deleted credentials out of credential manager.Tried activating office with another Office 365 account – that didn’t work either.Logged in with the domain administrator account and tried activating Office – failed.Tried Repairing Office 2016 – didn’t work.I wasn’t sure what to do so I tried all the things below – but to no avail.

If this keeps happening, you should try repairing your office product. Sorry, we ran into a problem while trying to install the product key. He signed into his account, and Office 365 tried to verify his subscription but it would eventually error out and say:

After the installation, a dialog box prompted him to sign into his Office 365 account to activate Office. We uninstalled Office 2013 and downloaded and installed Office 2016 from his Office 365 account. The computer was running Windows 8.1 with Office 2013. Office 2016 activated just fine on all the computers besides one PC. For a majority of the users, we purchased Office 365 Business Premium licenses that included Office 2016 (Buy Office 2016). Recently, we upgraded a customer from a local Exchange server to Office 365.

Activate office 2016 product key