A320
Airbus go around:
Don’t confuse between A/THR and T/L.
During approach, h A/THR being supposed ON, Thrust Levers ( T/L) are in the « FLX « detent.
FMA ( Flight mode annunciator ) is showing on the left ( thrust mode ) SPEED
In case of go-around and considering Thrust:
Just need to push forward the thrust levers in the TOGA detent, passing through the MCT detent.
Then observe FMA :
The thrust mode annunciator is showing MAN TOGA, then and only at that point autopilot and or FD ( flight director) are permitting the aircraft to be in the SRS mode and to maintain a speed as V2+10 or greater.
Don’t touch to the thrust levers before FMA is going in THRUST CLIMB flashing in white.
Only at that time retract the thrust levers in the FLX detent passing again trough de MCT detent.
That’s all
Without A/P in the mean time pull back the stick until the aircraft is reaching a pitch of 15°, and follow the FD bars.