DSC-22_30-80-40:
Setting at least one thrust lever to TOGA detent engages both SRS/NAV modes if:
- The flaps lever is at least in position 1, and
- The aircraft is in flight, or
- The aircraft has been on ground for less than 30 s (AP disengages and can be re-engaged 5 s after lift-off).
Your flap lever was in position 1 (or more), so TOGA engaged GA mode.