Hi guys, We also have similar problem with ASWebAuthenticationSession on 10.15. The issue occurs when Safari is selected as default browser and it is been used for a while before the session starts. When it happens login window does not show up and CompletionHandler is never called. Closing Safari process helps to overcome the issue and the session window appears immediately after the current process is closed. It seems to be something wrong between OS and Safari, which prevents it to behave normally. Any help with the issue would be highly appreciated.