So the starter spins but the gear that engages with the flywheel does not come up and spin the flywheel to turn the motor.
Have I got that right ?
Second question is the machine still under warrantee ?
If so, call the shop you bought it from right now.
Really sounds like a stuck or broken Bendix ( bit that moves the start gear up to engage engine ).
These are hard to do anything with on engine but dead easy to work on once out.
However removing it will most likely void warrantee so you are on the knife edge.