Hi there

I do know that MSD have a little bit of grace with applications in regards to making sure you update the IRD at the same time as going through the application process. The only thing I could suggest at the outset would be to submit the new employees contracts as confirmation that they were a) on board with you as a business and b) it confirms their payroll timeline and start date.
I know waiting on the phone with them is painful, the wait can be very long, but it would be worth hanging on to be able to send that information through.

Ngā mihi