Kubernetes login not working

Logging in to Kubernetes using webis k8s login does not work unfortunately. Still gives the "standard" error:

Unable to connect to the server: failed to refresh token: oauth2: cannot fetch token: 400 Bad Request
Response: {"error":"invalid_request","error_description":"Refresh token is invalid or has already been claimed by another client."}

After login at https://openid.webis.de/k8s-login, everything works fine.