Hello, I'm trying to implement the Viessmann API into my Openhab3 environment. I read the documentation carefully and all steps until the "refresh token request" worked very well. My challenge now is that the refresh token call does not work. This is the call I'm trying: curl -X POST "https://iam.viessmann.com/idp/v2/token" -H "Content-Type: application/x-www-form-urlencoded" -d "grant_type=refresh_token&client_id=07...&refresh_token=XX_x..." I always get {"error":"invalid-token-request"} as response, but I can't find the mistake as the call is exactly as described. Can you help me, please? Thanks a Lot.
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