Autosized FCU not Cooling the Space

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EnergyPlus sizes coils to meet zone sensible loads. You might try increasing the Sizing:Zone Zone Cooling Design Supply Air Temperature (e.g., from 12.7 C to 14 C). This will increase the zone design cooling air flow rate and potentially provide more cooling capacity.

Sizing:Zone,
  Offices,                   !- Zone or ZoneList Name
  SupplyAirTemperature,      !- Zone Cooling Design Supply Air Temperature Input Method
  12.7777777777778,          !- Zone Cooling Design Supply Air Temperature {C}

Look in the eio file after the simulation to see the impact of design changes. Specifically, look at these results:

! <Zone Sizing Information>, Zone Name, Load Type, Calc Des Load {W}, User Des Load {W}, Calc Des Air Flow Rate {m3/s}, User Des Air Flow Rate {m3/s}
 Zone Sizing Information, ZONE_22, Cooling, 8246.43576, 8246.43576, 0.72219, 0.72219
 Zone Sizing Information, ZONE_22, Heating, 2446.81161, 2446.81161, 0.14788, 0.14788

! <Water Cooling Coil Capacity Information>,Component Type,Name,Nominal Total Capacity {W},Nominal Sensible Capacity {W},Nominal Latent Capacity {W},Nominal Sensible Heat Ratio, Nominal Coil UA Value {W/C}, Nominal Coil Surface Area {m2}
Water Cooling Coil Capacity Information,Coil:Cooling:Water,ZONE_22_ZFPFC-22_COOLING COIL,15200.58,11056.89,4143.69,0.73,1565.52,15.88