I’ve just tried this out in Germany (Cologne) to investigate the reported problems with German DVB-T2.
The two WDR/ARD muxes work fine, instant tuning and no errors, but ZDF (and the encrypted Freenet multiplexes) do not work. This seems to be a problem even reported elsewhere by Xbox users with the stick - that the ZDF multiplex does not tune in.
I’m using an indoor antenna, but I can see the transmission antenna on the Colonius tower less than 2km away. The ARD channels are very strong with flawless reception.
The DVB-T2 parameters are the same for the ZDF mux as for the WDR1-Süd mux which does work (64QAM, GI 19/128, FEC 3/5), so there must be something else different with the signal that causes this tuner to fail.
Curiously, my old PCTV 290e also fails to lock the ZDF signal, but succeeds with the two ARD muxes like the Xbox tuner. This was the same with the transmissions from another part of Germany last year, I had assumed that the ZDF signal was just too weak, but I think that the tuner just can’t tune it for a technical reason.