Unable to get keycloak authentification

[sbrutin]

Sorry to bother you with my problems but I cannot configure dashy with keycloak.

I get this error message in the page :
"It looks like something's gone wrong..."
and this one on console log :
"Failed to authenticate with Keycloak

This is likely not an issue with Dashy, but rather your configuration.
If you think it is a bug, please open a ticket on GitHub: https://git.io/JukXk"

On network traces, It seems fine, I get a token from keycloak :

here my dashy config file :

  auth:
    enableGuestAccess: false
    users: []
    enableOidc: false
    oidc: {}
    enableHeaderAuth: false
    headerAuth:
      userHeader: REMOTE_USER
      proxyWhitelist: []
    enableKeycloak: true
    keycloak:
      serverUrl: https://secure.xxx.xx
      realm: xxxxxxxx
      clientId: dashy-client
      legacySupport: false

and my keycloak configuration :

What did I do wrong?
Thanks