MST via dp not working

hi I recently got new monitor that has dp output, so I linked that with another one using dp to hdmi cable.

but right after I put a code, both two displays shows only black screen.
but when i discharge the code, it returns to normal.

when i connect each displays directly into the computer, it works completely normal regardless of the number.

how can I fix it?

I don’t think that works, as far as I know, MST is DP to DP only.

Keep in mind, MST is limited by the total resolution and number of displays supported by your GPU/Display Port.