I want to use CKEDITOR in my form. I pass the model to CKEDITOR but nothing happens, I did the same thing without using the form and it works correctly, What is the reason?

I have uploaded the codes and images below,

please guide me!

Thanks,

package.json

//...
  "@angular/core": "^11.2.2",
  "@angular/forms": "^11.2.2",
  "ng2-ckeditor": "^1.3.4",
//...

index.html

<!--...-->
<form *ngIf="active" #ticketForm="ngForm" novalidate (ngSubmit)="save()" autocomplete="off">
  <ckeditor #ticket_MessageOfTicket="ngModel"
  [(ngModel)]="this.messageOfTicket"
  [config]="config"></ckeditor>
  <!--...-->
</form>
<!--...-->

index.component.ts

//...
 config:any = {
     contentsLangDirection: 'rtl',
  }

//...
  ngOnInit(): void {
       this.messageOfTicket="<p>Hello <strong>world !</strong></p>";
   }
//...