• Import SSL Certificate on all servers to CERT:\LocalMachine\My
• run following powershell command on ADFS server

Set-AdfsSslCertificate –Thumbprint CERTTHUMBPRIBT
Get-Service adfssrv | Restart-Service

• run following powershell command on WAP server

Set-WebApplicationProxySslCertificate –Thumbprint CERTTHUMBPRINT
Get-Service appproxysvc | Restart-Service

Verify function with navigating to /adfs/ls/idpinitiatedsignon.htm