Thunderbolt display on mobo: Asrock Z790 PG-ITXTB4

[Sterlex]

I need help ! 

Questions:

1. Why is the display are not detected on my freshly builded PC with (Thunderbolt)?
2. And I don't understand why its working on my laptop?

 

Story:

I build a new PC with a motherboard that supports Thunderbolt 4.
Sadly, the dock wont detect my monitor(s).

The same dock works on my laptop, which doesnt even thunderbolt support tb3 spec?
the 2 pc are in Windows 11.

 

Hardware Details:

• Working laptop:
  • Lenovo Legion 5 17ACH6H plugged on rear USB-C 3.2 Gen 2. NOT EVEN TB3!!
  • Dock: Lenovo ThinkPad Thunderbolt 3 Dock Gen 2 (https://support.lenovo.com/us/en/solutions/pd500265)
  • Frimware up to date on lenovo dock.
• Fresh build PC / not working:
  • Installed lastest thunderbolt driver on windows, 
  • Thunderbolt is active in BIOS
  • Board: Asrock Z790 PG-ITXTB4 (https://pg.asrock.com/mb/Intel/Z790%20PG-ITXTB4/index.asp#Specification)
  • Processor: 13600k
  • GPU: RTX 3080

Thunderbolt / type c is such a mess haha...