What license is needed in an SDO ORG (DCDO) to be able to create an Agent?

Hi,

I have tried attributing almost all possible license to my user in my SDO, but I do not succeed

in being granted the "+agent" option top right to add/create a new Agentforce agent in SETUP->AGENTS.

(I know the button should be in the top right, because when spinning up a playground on trailhead it is located there).