Http post with variable

I don’t know, but it works fine here. I use a BLL string variable by the way.
(Homey Logic has/had a bug where it adds a trailing whitespace to the values)

The tag is just a string as you can see, and the value of the BLL variable is 25.10:

Screenshot from 2023-11-15 03-24-35

Reply from the webhook listener flow: