Rest command POST not working

Hello
I created a led matrix board that I want to use from HA, I want to use a rest command however I seem to be unsuccesful in calling it from HA
When I try to approach the Wled through its IP and by using Fiddler it is succesful, so I might be missing something obvious in HA

I have added to configuration.yaml

rest_command: !include rests.yaml

And then in the rests.yaml the following code:

wled_text:
    url: http://192.168.2.18/json/state
    method: POST
    payload: '{ "on": true, "bri": "{{brightness}}", "seg":{"id":0, "col":{{color}} , "fx":122, "n":"{{text}}" }}'

When I try to execute a Yaml in developer tools

action: rest_command.wled_text
data: 
  text: "test me"

It returns

content:
  error: 9
status: 400

In Fiddler the payload looks like the following
{ “on”: true, “bri”: “{128}”, “seg”:{“id”:0, “col”:[[0,255,200]], “fx”:122, “n”:“I Love Home Assistant” }}

Now I cannot see what HA is sending out or how it forms the actual POST before it sends it to the target host, this might be able to tell me where the issue is. Anyone know if this is possible from HA or do I need to start a sniffer on my HA Raspberry Pi to capture it?

Any ideas which formatting I might be overlooking or what I can investigate further?

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