[keycloak-user] redirect_uri in token exchange redirect

Hi, i did an account linking on two keycloak IDP my keycloak 4.8.3 on the two server When i do a token exchange, i get a error_description":"identity provider is not linked, can only link to current user session","account-link-url":" https://iMyIDP1:9443/auth/realms/Realm/broker/A_for2/link?nonce=32cb2809-... ","error":"not_linked" when i enter this url in a browser, i get an Invalid Request When i look at the error log, i see : type=TOKEN_EXCHANGE_ERROR, realmId=realm, clientId=realm-secure, userId=null, ipAddress=172.18.56.212, error=invalid_request, reason='requested_issuer has not linked', auth_method=token_exchange, grant_type=urn:ietf:params:oauth:grant-type:token-exchange, requested_issuer=1_for_2, client_auth_method=client-secret type=CLIENT_INITIATED_ACCOUNT_LINKING_ERROR, realmId=R1, clientId=R1-secure, userId=null, ipAddress=172.18.56.212, error=invalid_redirect_uri When i loot at the code : https://github.com/keycloak/keycloak/blob/master/services/src/main/java/o... line 213 the redirect_uri is mandatory, however it's not in the generated link. Is it a mistake, or did I missed something ? Thanks for any help, Amaury