if I needed my air conditioning fixed, why would I have to have the air condition technician report to the Facilities Manager, who really has nothing to do with my air conditioning?
Does your air-con pass through common property at any point? If so, the building manager, representing the owners corp, is entitled to check the bona fides of the people working on it (although this could be done with a phone call, and email or a text message).
There’s also the question of moving equipment through common property, parking, removal of rubbish and potential inadvertent damage to common property and other units.
Speaking as someone whose builder drilled through a hot water pipe while installing a towel rail, causing water damage 11 floors below, I can see why making sure contractors have appropriate knowledge and insurances could be important.