Developer Portal – Your clients section not loading

ilawx — Mon, 26 Oct 2026 12:18:48 GMT

Hello Viessmann Support,

I am experiencing an issue with the Developer Portal (Basic plan).

After logging in, the "Your clients" section remains completely empty, and the "+ Add" button is missing. The API transaction information also fails to load.

I understand that other users have reported similar issues.

Could you please check my developer account and reset or repair the API client data in the backend if necessary?

I would like to create an API client to monitor my Vitodens 100-W through Home Assistant.

Thank you for your help.

@CustomerCareMichael

Thema "Developer Portal – Your clients section not loading" in The Viessmann API

Developer Portal – Your clients section not loading