I made it working, i used "Client" in ClientID but there was also a problem of "/" in feed path.
I found issue in Python code.
Thank you for help.

Hello
I also have problems with Adafruit. I can't send temprature to my feed Temperature.
What is the difference between "set client ID" and "User" in UIFlow mqtt block ?
I join mt screeshot, maybe someone can tell me where is my mistake.
Thanks.