Thanks for the help. I will check these settings. I did try normal supports and the same thing happened - only one support generated. Strange this is that this morning I revised the print temperature and build plate temperature down by 10C and switched off the fan (it was at 10%) and re sliced, tree supports were then generated for all three holes. I’m using ASA, it’s recommended not to use a fan so supports are required. Will switch back to normal supports.