Noticed IDPInitiated signon page is not loading by default in Adfs 2016 as it is loading in pervious versions.
Default IDP URL : https://adfsname.domainname.com/adfs/ls/idpinitiatedsignon.aspx In my case, https://sts.windowstechpro.com/adfs/ls/idpinitiatedsignon.aspx
Ideally, in ADFS 2016 it is disabled by default.
Run the below command to see status of the IDP Initiatedsignon page.
Get-AdfsProperties | Select-Object EnableIdpInitiatedSignonpage
Now, To enable the IDP Initiatedsignon page run the below command, Set-AdfsProperties –EnableIdpInitiatedSignonPage $True
restart the adfe service in all the adfs 2016 servers using the command
Restart-Service adfssrv it can be done using services.msc as well.
It is all done, try to load the Idpinitiated signon page