1. Open the EAC
Click on start and then expand Exchange Server 2016 and click on Exchange Admin Center.
2. Login to the EAC
If you have a certificate warning, click yes to continue and then enter the credentials to login and press enter.
3. Click on Servers
On the left hand side, click on Servers.
4. Click on Certificates tab
On the top right, click on Certificates.
5. Select a Server
Select a server from the drop-down list.
6. Double click Certificate
Double click the certificate you want to update and then on the properties page, click services on the left hand side and make your selection and click save once done.