How to pass the variables' content from MAKE to Flowise?

[Sofia-Happy-Wibes]

Hi, I want to populate the State of a V2 Flowise agent (Flowise version V3) with some of the variables' content coming through a MAKE.com automation. It proves very difficult to get the variables into the agent. After many trials, I'm now 'just' trying to send a simple json to populate two of the states of my start node. It proves impossible to make it work. I've checked in many ways, but maybe i'm missing something.

I'm sending this simplified json:

{
"question": "start",
"overrideConfig": {
"sessionId": "SIMPLE_TEST_001",
"vars": {
"session_id": "SIMPLE_TEST_001",
"user_name": "Sophie Test"
}
}
}

In the Flowise 'response' to the JSON, the overrideConfig WORKS, but the variables are not taken into the STATE of the memory.
I allowed the override in the agent parameters, verified the CORS_ORIGINS and the IFRAME_ORIGINS variables on Railway.
I tried to use after the State node a Custom function tool and an LLM to take the data, but it does not work.

Any one has faced and solved this issue? Many thanks in advance!