Unable to POST to Open AI API from Thunkable WEB API

Hello all, The following does not trigger a POST to OPENAI web API.
The KEY is correct and tested. The Headers and Body seems to beok as well. At least i have tried in and out and can see a potential error. Can you?
The c´varios Alerts are there to see if the post is sent, if i get error or a response back - but NOTHING is happening. Excelt i get “User1” back in the text box as expected.
I am sure it is a small silly thing i missed - i just cant see it… Any ideas…