Angular - NgIf not working on component: "NG0303: Can't bind to 'ngIf' since it isn't a known...

I'm trying to use a ngif directive on a component, but keep getting the following error on the console: "NG0303: Can't bind to 'ngIf' since it isn't a known property of 'p'.", and the element just doesn't appear. Also, I'm using po-ui framework for some elements.

Here goes the ts and html codes of the component:

cadastro-usuario.component.ts:

import { Component, OnInit } from '@angular/core';
import { PoButtonGroupModule } from '@po-ui/ng-components';
import { PoButtonGroupItem } from '@po-ui/ng-components';

@Component({
selector: 'app-cadastro-usuario',
templateUrl: './cadastro-usuario.component.html',
styleUrls: ['./cadastro-usuario.component.css']
})
export class CadastroUsuarioComponent implements OnInit {

constructor() { }

ngOnInit(): void {
}

buttons: Array<PoButtonGroupItem> = [
{ label: 'Vínculo', action: this.vinculo.bind(this) },
{ label: 'Endereço', action: this.endereco.bind(this) },
{ label: 'Contatos', action: this.contatos.bind(this) },
];

vinculo() {
alert("vinculo");
}

endereco() {
alert("endereco");
}

contatos() {
alert("contatos");
}
}


cadastro-usuario.component.html:

<p style="display:inline-block; margin-left:80px; margin-top:20px; width: 600px;">
<po-button-group class="po-md-12" [p-buttons]="buttons"> </po-button-group>
</p>

<br>

<p *ngIf="true" style="display:inline-block; margin-left:80px; margin-top:20px; width: 300px;">
<po-input name="vinculo" p-label="Vínculo"> </po-input>
</p>

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