I have this same model 1133-D001 like Baptiste Jn (and Nick111 apparently).
The thing is, the terminal board on the PCB has only two screws on two connectors! No VA wire, only #1 and #2 connectors.
Two wires are connected together on #1, while two other wires are connected together on #2.
I measure constant 22VDC with a voltmeter between these two connectors, all the time.
But the opening button on the interphone case is able to open the main door downstairs only if someone rings the bell from the intercom panel in the street first.
However I don’t understand Yohannkazz’s message above as he points to a solution involving models that have 3 connectors (including the VA wire, which is absent from the model described in this thread).
Please, if someone managed to make this 2x2 wire URMET system work with Nuki Opener, tell me how.