Hi,
On the server, we can use the MMC.MSC to generate CSR.
To generate a Certificate Signing Request (CSR) via a MMC certificate snap-in using Microsoft Windows, perform the following steps.
From Microsoft Windows, click Start.
In the Search programs and files field, type mmc.
Click File > Add/Remove Snap-in.
From the list of available snap-ins, select Certificates.
Click Add.
Select Computer account.
Click Next.
Select Local computer (the computer this console is running on).
Click Finish.
In the Add/Remove Snap-in window, click OK.
Save these console settings for future use.
Access your MMC snap in > right click the Personal folder.
Select All Tasks > Advanced Operations > Create Custom Request.
For more details, you can refer to the following link:
https://knowledge.digicert.com/solution/SO29005.html
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Feel free to let me know, If you have any questions about this.
Best Regards,