POST request with Alamofire and deeply nested dictionary

Whenever I send some request with basic parameters, it works like a charm, for example:

let parametersServices  = ["name": ["first": "\(givenName)","last": "\(familyName)"    ]]

But if I send parameters with deep nesting, it does not make any effect on those deeply nested parameters, for example:

let parametersServices  = ["name": ["first": "\(givenName)","last": "\(familyName)"    ],"services" : ["mentoring": ["profileId" : "id123","title" : "mentor"        ]    ]]

Am I doing something wrong or is such type of PATCH does not supported to modify deeply nested profileId ?

Because if I try simply create new user with same parameters, it works fine, however there it does not accept changes with PATCH for existing items.