According to posts on Reddit, it seems that quite a few customers have had their Nikon Z8 (buy here) orders cancelled, some without any reason provided whatsoever. The only thing these posts have in common is that they were all ordered (or pre-ordered) directly from Nikon itself. This doesn’t appear to be an issue with other retailers – or, at least, not enough of an issue that people are posting about it.
The posts typically say that the customer placed their order, received confirmation of their order and then suddenly received emails letting them know that their orders had been cancelled. The issue appears to stem around bank or credit card authorisation, but exactly where the blame lies isn’t quite clear.