Angular - Form control does not identify field within an object I refer to

Question

How do I make the form control name identify a field that is within a model I refer to? I’m having this error: Cannot find control with name: 'dtInicio'

i have this field in the formcontrol dtInicio:

<div class="p-field">
      <label>Data inicial de inscrição</label>
        <p-calendar
            [locale]="pt"
            [dateFormat]="'dd/mm/yy'"
            [readonlyInput]="true"
            [showButtonBar]="true"
            formControlName="dtInicio"
            tabindex="0"
            maxlength="10">
        </p-calendar>
      </div>

My model is like this:

constructor(
        public numeroEdital ?: string,
        public inscricoes ?: EditalInscricaoModel,
    ) {
        super();
    }

how can I make my form control identify the dtInicio field, even though it is within another model that I refer to in this main model?