SSON fails with CWA 2402 and 2405.10 

The logon to a session stops at the "other user" screen .

It is also noticed that the ssonsvr.exe process is not running on the client 

"Enhanced domain pass-through for single sign on feature" is enabled  on the client device.

However the customer is using legacy SSON and not Enhanced domain pass-through . Enabling Enhanced domain pass-through has the effect of preventing ssonsvr.exe from loading on the client.

Enhanced domain pass-through needs to be also enabled on the server side . If not using "Enhanced domain pass-through" then this setting should not be touched on the client 

https://docs.citrix.com/en-us/citrix-workspace-app-for-windows/domain-passthrough-for-single-sign-on.html