Commissioning not possible

The device has much to offer two methods - go do with me not.
My router is the standard unit of Vodafone, the DSL Easybox 803A, so nothing special.

Allegedly, the router provides the opportunity via WPS button to easily connect to the repeater.
Does not happen with me. Either I can make Wi-Fi, or at (WPS function was reviewed and was present), but in a connection mode I never got.

Method two can then be made by manual configuration via a web browser.
This goes both wirelessly and via LAN cable, unfortunately for me, this variant also, unsuccessfully, with or without cable.
The "Quick Setup" can not complete correctly, the connection is not established in the last step and then my Repeater infected still useless in the socket. Has become a permanent condition.

Have read over my days all sort of information about routers and repeaters, but I personally am at my wits end.
Do not know whether the Easybox incompatible with the repeater, or if I'm just too stupid, despite assurances to have a compatibility with all current WLAN routers.
Device goes as back soon!