Is your employer's occupational scheme a defined benefit or a defined contribution scheme?
When you transferred your PRSA in, you should have got full details of the benefits/value you transferred in
From Pension Board website
Qualifying service
A term defined in the Pensions Act, 1990, as amended, as the service which a pension scheme member must complete before becoming entitled to a preserved benefit on leaving service. Currently, it is two years' service including any period in a previous scheme from which a transfer value was received.