Hi Michael I really hope this is a bee in my hotel! But it has me stumped. Funny notch on eye near antennae , pointy abdomen end, not carrying pollen but seems to have some fur on face and under thorax and a bit of that bee basal vein. She keeps going in the tunnel seemingly to rest and fuss a bit with the clay pile at the entrance. I could not see a good wasp match but.... Advice appreciated!
Ceylalictus perditellus is the only Australian bee with a notch in the inner margin of the eye and that species is yellow and green and easily recognised. Wasps, too, use bee hotels as this one has done.