So it turns out all the nominations have been appearing in the “Users” category, which I have muted to avoid the noise. But now there’s literally no way for me to get to that category through the UI (when I get a direct link it works, and then I can view the category, but not through the normal views and certainly not from my phone).
If this is the process, I’m now strongly in favour of creating a new category. I had assumed they would come to committers, since only committers can nominate candidates (and we would temporarily add nominees to the committers group to be able to answer questions).