Why can't I play in big maps?

I just reached stress level 15 and unlocked the big maps. But I can’t play in them. There are only those old, small maps. Does anyone know why this happens?

They have a chance to pop up, they just get added in your map roster, so it’s random

But it’s like, it never appears. I have started like 10 matches today but nope, there isn’t any.

Chances are very low

First you have to match with someone level 15 or higher, And there is another percentage of getting a large map.
So Yea, big maps are kinda rare.

Ok, thanks for your help.