404 Not Found for "Get client-level role mappings"

i get 404 at this url:

Get client-level role mappings for the user, and the app
GET /{realm}/users/{id}/role-mappings/clients/{client}

My url:

curl -X GET -H 'Authorization: Bearer myAccesToken'  -i 'localhost:8100/admin/realms/myportal/users/9b9c33b3-a962-41d0-b32c-65f33aa296c0/role-mappings/clients/my-clientId' 

other url works:

curl -X GET -H ‘Authorization: Bearer myAccesToken’ -i ‘localhost:8100/admin/realms/myportal/users/9b9c33b3-a962-41d0-b32c-65f33aa296c0/role-mappings’