A320 flight crew reported engine acceleration anomaly during takeoff roll resulting in a rejected takeoff.

Narrative

I advanced the thrust levers to 1.05 EPR (Engine Pressure Ratio). Engines stable. I then advanced the thrust levers. Engines started accelerating properly. CL (Climb Detent) and later Engine 1 advanced normally. Engine 2 EPR hung about 2/3 low. Aircraft yawed; EPR 2 not advancing. I believe I was out of the keep out zone. I rejected the takeoff at 40/50 knots. I briefly considered Max thrust. However with #2 not accelerating at all I was concerned about #1 continuing to advance to Max and #2 not accelerating. We did get a quick ding and ECAM flash. It might have been 'ENG THR levers not set'. Regardless; it was unsafe to continue and advance to MAX and the RTO (Rejected Take Off) was underway. After review; maintenance presented a company bulletin. We decided it would be safe to attempt another takeoff but in MAX. On next take off; #2 did not advance as quickly. But it was smooth; stabilized at Max and I decided to continue. In hindsight; even though I feel it was a safe maneuver; I wish I would have accomplished another RTO. Of course I have more information now. The jet was grounded in ZZZ1 and after an engine run it looks like the P2T2 probe was an issue.