Set Formgroup valid or invalid angular 7

I have one form where I need to set the fields to valid or invalid, because I want to edit the user, but the button stay disabled

edit.component

ngOnInit() {
this.getForm();
this.getRole();
console.log(this.formGroup.valid)
}

getForm() {
this.formGroup = this.formBuilder.group({
name: ['', Validators.required],
label: ['', Validators.required],
});
}


when I'll go to the page edit I would like abilit the button I need to set invalid the form

<button type="submit" mat-button color="primary" [disabled]="!formGroup.valid">Alterar</button>


for example

if(user) {
this.formGroup (invalid)
} else {
this.formGroup (valid)
}




this is my page to edit item, but the formgroup is invalid even with the field filled in, why ?

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