In my jurisdiction, I am NOT allowed to ask vaccination status, nor do I want to. The government mandates wearing a mask in public spaces and therefore they must be worn in the house, outside of the guest rooms. We were told by the hotel association to not argue with people, just remind them once and if they don't comply, to simply call the police and let them handle it.
But, the government mandated rules for eating require us to check vaccination certificates to eat in the dining room or outside. You aren't required to show it to us, if you want to take breakfast away. So on the first morning, you can either show us a certificate, or we provide a breakfast in a meal prep container that you can take to your room and eat there.
What drives me crazy is that my wasted food has increased and so has the garbage, because we have to use individual butter, etc. The rules changed in November again and I don't have to limit capacity at the table anymore, but I'm supposed to keep space between guests, which we do. No lucite barriers (but they are silly, because they don't work.... it's airborne, we all know it. Neither do face shields work, only masking.)
We have only had one anti-vax person and this was before the vaccination passport mandate. They understood the mask mandate and wore it in public (when we present, at least). We had them eat on the patio at the time, but today, they would have no choice but to eat in their room.