AW2521H, mDP error

Just buy this monitor (AW2521H), and did every step carefully the set it up. When I connected the DP to mDP cable to my laptop (Dell G15, i7 11th gen, RTX 2060) on monitor next message appear "DP input" then "entering eco mode".

I checked everything I could find on internet, updated all drivers, make sure every cable is plugged in and nothing. When I connect the mDP, in display settings it appears that I have 2 screens, but both are the same (1|2), it cannot detect any other display than my laptop. 

On the other hand, with HDMI connection it works fine. But I can get only 240Hz out of his true potential with DP of 360Hz.

What can I do?

I will add a screenshot made when trying to figure out what the problem is in comments.

1 is my laptop

2 is the monitor connected with HDMI

3 is the same monitor connected with mDP, but I can't access it.

Sometimes tabs open on that screen, but because I can't access it I have to unplug the DP cable then see the tabs on one of 2 displays that actually work.