Foscam FI9831W not tilt an pan function in the IP Camera binding

I organized a Foscam FI9831W as it is reported working with API and OVIF. The pan and tilt function is not working. I only get an snapshot an the alarm through the binding.
Is there a known problem with the pan and tilt function or a workaround?
No problems are shown in the log files. The pan and tilt items receive the commands.
Trying to check the ONVIF settings in the ONVIF Device Manager leads to:
"Die http-Anforderung ist beim Clientauthentifizierungschema “Anonymous” nicht autorisiert. Von Server wurde der "Authentifizierungsheader “Basicrealm=“qSOAP Web Service”” empfangen.