No connection to client

[jasuim]

I've been having issues with connecting to the client at the Viessmann API since 30/10/23 at approx. 14:30
As I receive a message about unknown client I have deleted that one at the Viessmann Development Center and added a new one with no luck.

viessmannapi.0	2023-10-31 07:51:09.399	error	{"error":"invalid_request","error_description":"Invalid request: Missing or empty code parameter"}
viessmannapi.0	2023-10-31 07:51:09.398	error	AxiosError: Request failed with status code 400
viessmannapi.0	2023-10-31 07:51:09.116	error	{"error":"invalid_request","error_description":"Client not registered."}
viessmannapi.0	2023-10-31 07:51:09.114	error	AxiosError: Request failed with status code 401

Screenshots & Logfiles
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• Adapter version: 2.3.2
• JS-Controller version: 5.0.15
• Node version: 16.20.2
• Operating system: Raspberian

EDIT: It seems to be an issue on the end of Viessmann as I get the same message when I'm trying to generate an access token. However, I have an active client and I have (re-)added it multiple times.

EDIT 2: Follow up at the Viessmann forum: https://www.viessmann-community.com/t5/The-Viessmann-API/Client-not-registered/td-p/377152

[TA2k]

It takes a while until the client id is active

[jasuim]

It was active for months. And still doesn't work.