Colleagues will share a cabin. They will not share a bed. So the number that decides a company cruise is not how many cabins a ship has. It is how many of them are twins.
The operators publish their bed mixes, and the ships we charter for corporate retreats on Ha Long Bay differ more than their guest counts suggest.
Aspira has 22 cabins: 11 twins, 8 doubles and 3 triples. Azura has 30: 13 twins, 11 doubles, 4 triples and two Imperial Suites. On Athena Royal, every one of the 22 cabins takes one double or two singles, so the whole ship can be made up as twins, though no cabin there takes three adults.
Do the sum for your own team before you pick the ship. A team of 24 sharing in pairs needs 12 twin cabins. Azura has 13. Aspira has 11, so somebody moves into a triple or takes a double alone.
Then build the rooming list around the doubles. Give them first to anyone travelling with a partner, then to whoever your travel policy says goes alone. Let people choose who they share with where you can, because that choice decides more about the trip than the cabin grade does.
For Athena Luxury, Signature Halong and Athena Premium, the bed mix is not published in a form we can quote. Ask before you count on twins there.