Node-red-contrib-fritz and FritzBox 7490: Error on using service / action

I need your help. Using node-red-contrib-fritz NodeRed 2.2.2, FB 7490 with FritzOS 07.29. Trying to make a call "urn:dslforum-org:service:X_VoIP:1" -> "X_AVM-DE_DialNumber". While this works well from an ESP8266 unit (so configuration on FB is fine) I run into consistent errors ("Action failed with error: TypeError [ERR_INVALID_CHAR]: Invalid character in header content ["authorization"]").

Same happens on other services (e.g. GetDeviceInfo).

Does anybody have an idea what the problem might be?

BTW: The module pallette shows a warning "Assertion failed".

I had the same error a long time ago - here is the solution:

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