“Can’t Verify The Signature” Installation Error in Office 365/2021/2019

To fix the installation error Can’t verify the signature, use the following methods. We will assist or give live support for all versions of Windows and Microsoft 365. This Error “we’re sorry but we can’t verify the signature of files required to install your office product” applies to all versions of Windows like Windows 11, and Windows 10.

We Should verify these signatures to keep our computers safe. This can be done by installing the latest product and if the Office installation fails and pops up with an error trying to download Office 365 product again. Similarly, make sure that the downloaded Office 365/2021 product is from a trusted source. 

Can't Verify Signature

Reasons for getting the Error “Can’t Verify The Signature”

The user is not able to can’t verify the signature in Microsoft Office 365/2021 in Windows 10/11. If they are using a device that doesn’t have hardware compatibility for the office applications. The user should upgrade the device with the operating system to can’t verify the signature issues in Microsoft Office 365/2021.


This “Can’t Verify The Signature” error is caused due to the installation of Microsoft Office 365. The user might have installed the software without updating it or without verifying the signature. This issue is resolved by cleaning all the temporary Internet files in the system. Delete these from the system and then download Microsoft Office and check the Microsoft 365 updates

Microsoft Office quick Repair

How To Fix Microsoft office 365/2021 can’t verify signature?

  • First, open Microsoft 365 and click on settings
  • Next, click on account settings and then choose security info
  • Finally, follow the instructions on screen to can’t verify your signature
  • If you are unable to can’t verify your signature, this is likely due to an issue with the Microsoft Office 365 installation in windows 10/11.
  • First, make sure that you have installed the latest version of Office 365/2021
  • Similarly, if you are still unable to can’t verify your signature, please contact our support team for further assistance

Alternative methods to install Microsoft Office 365/2021/2019 installation 

If you are using a wireless connection, connect your computer through a network cable. This will speed up the download and installation process of office 365/2021

How to repair Microsoft Office 365/2021/2019 in Windows 10/11?

There are two ways to repair Microsoft Office 365, Quick Repair and Online Repair. In Quick Repair, issues are quickly fixed without Internet connectivity but whereas in Online Repair, issues are fixed a little later and an Internet connection is Required. Consequently, to repair Microsoft Office 365/2021/2019 using the Quick Repair tool, follow these steps

  1. Firstly, press the Windows logo key + X to see a list of commands and options. (Basically, a quick way to get to Programs and Features in Control Panel)
  2. Then select “Programs and Features
  3. Click the Office 365/2021 program you want to repair, and then select the Change button
  4. Choose quick repair or online repair options to finish the repair process
  5. Finally, restart your computer after the repair is complete

Other Errors while Installing Microsoft Office 365/2021 

Here if you face a direct issue with outlook, we should make a repair or reinstall with the above steps. Let us see how we can fix an Outlook error! A recent issue faced with outlook is Operational error.

We will make you understand how to fix can’t verify the signature and you can also seek email support services from here.  You can also chat with our experts here, I am sure they will provide you the perfection solutions to resolve your issue completely. You can also visit our website for more details and information.

Can't Verify The Signature