Govee API use

I have an H6182 led strip set up in the Govee Home App and this is integrated into HA via the Govee app. My HA system is on a HA Yellow,

I am working with dashboard slider cards to make this easier to control in HA. Although I can see the attributes in Developer Tools, I want to see these in more detail and, so, attempted to call the api, using my api token, from Postman api app.

This is on my laptop and not the HA Yellow. I have failed every time to get this to work. I have used the url in the Postman Govee instructions (Request URL: https://developer-api.govee.com/v1/devices) which I believe is an old url and tried the current one on he Govee site (https://openapi.api.govee.com/router/api/v1/user/devices) but neither work. Some results are below:

GET https://openapi.api.govee.com/router/api/v1/user/devices?Govee-API-Key=xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx&Content-Type=application/json

400
Bad Request
GET https://developer-api.govee.com/v1/devices?Govee-API-Key=xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx

{
    "message": "Miss API Key",
    "status": 401
}

Can I only call from the HA instance or is there something basically incorrect in my calls?