Replacing the SSL certificate for AD FS

In order to replace the certificate on ADFS server sync with office 365 Azure Active Directory you need to obtain legal certificate then execute this command on the ADFS server :

On the primary AD FS server, use the following cmdlet to install the new SSL certificate

Set-AdfsSslCertificate -Thumbprint '<thumbprint of new cert>'

The certificate thumbprint can be found by executing this command:

dir Cert:\LocalMachine\My\

More information can be found here :

Managing SSL Certificates in AD FS and WAP in Windows Server 2016 | Microsoft Learn

Good Luck

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