How to Generate CSR on Microsoft Office 365?

Creating a Certificate Signing Request (CSR) in Microsoft Office 365 involves two methods

• Utilizing the Automatic CSR Generation Tool
• Utilizing the Office 365 Admin Center

Using the CSR Generation tool is quite easy and quick; make sure to fill up the required details properly.

Steps to Generate CSR in Office 365 using the Admin Center

Here are the detailed steps to generate a CSR file in Microsoft Office 365:

1. Sign in to the Office 365 Admin center.
2. Go to Users, then Open the user you want to generate a CSR for.
3. Click “Add key” under the “Additional keys” section
4. Add Key Wizard will open.
5. Select “Requested signing certificate” from the Key type drop-down.
6. Click “Continue” to confirm that a CSR will be generated for the selected user.
7. Click “Review + create” to initiate the CSR generation process.
8. The CSR generation status will show “Generating requested signing certificate“. This usually takes a few minutes to complete.
9. Once the status changes to “Requested Signing Certificate Generated.“
10. Click “Close“.
11. The CSR file will be automatically downloaded to your Downloads folder. You can find the CSR file with an extension “.csr“.
12. Open the CSR file. You will find lines of text starting with “
13. The CSR file contains the following information:
    • Subject: Contains the User Principal Name (UPN) of the selected Office 365 user
    • Public Key: Encryption key of the user
    • Version: CSR version, usually 3
    • Signature Algorithm: SHA-256
    • Issuer: The domain name of the Office 365 tenant
    • Subject Key Identifier: Unique ID of the public key
14. You can use this CSR file to request and install an SSL certificate for the selected Office 365 user.

Finally, the CSR is on your screen; make sure to perform the following steps to Install SSL Certificate on Microsoft Office 365.