Who has priority here?

You correctly chose the electric scooter as having priority.

The key sign here is the yellow diamond with a white border, which indicates that you are on a priority road. The small sign below it shows that this priority continues only when turning right. In this situation, you are turning left off the priority road, so you must yield to all traffic coming from the right and left on the priority road, in this case, the electric scooter.

The red truck (coming from your left) and you are both leaving the priority road and must give way to vehicles on the priority road—the electric scooter in this case. This is why the electric scooter has priority over both of you.

Remember: Vehicles on the priority road always have the right of way, unless special signs indicate otherwise. When you leave this road, you must yield to all oncoming and crossing traffic.