Changing certificates is a simple task – not very demanding – but in case of Office Web Apps and Office Online Server there is more to do. I will use Office Online Server as a synonym for Office Web Apps in the article. There is no difference in the process.
Before you change the IIS certificate, hold in, and think about the Office Online Server Farm setup:
Remember this command?
Set-OfficeWebappsFarm -CertificateName "YourShinyNewCertificateFriendlyName"
You will need to run this command to set the new certificate for your Office Online Server farm. But, before you start right way, please make sure these conditions apply:
- Be sure, that the certificate is installed on every server in your Office Online Server Farm
- Be sure, that the friendly name of the certificate is set to the same value on each server
SharePoint and Microsoft 365 
[…] MVP colleague Andi Krüger did a nice blog post on updating the farm certificate, and it's fairly simple – Set-OfficeWebAppsFarm -CertificateName […]
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