I don't think it is unusual for you not to have recevied a "suite" upgrade - Marriott rarely offers those - and many of us with years at Plat have only received a few.

Also remember that almost all hotels have more than 1 CL floor - so you may be on a CL floor but not be on the same floor as the lounge - happens to me quite often, especailly in hotels such as NYC, EWR, etc.