Unable to push a single string to an array without changing the string value

I have component called edit-customer which is an dialog window, which will receive the injected object from other component and will display that injected object properties(name,email).Below is the component code.

HTML

<form [formGroup]="editForm">
    <mat-form-field >
        <input matInput [(ngModel)]="data.name"   placeholder="Name"  formControlName="name" >
    </mat-form-field>
    <mat-form-field >
        <input matInput [(ngModel)]="data.EMailAddresses"   placeholder="Email Id"  formControlName="email" >
    </mat-form-field>
      <button mat-flat-button (click)="onEdit()">Save</button>
</form>

TS

import {Component, Inject,  OnInit } from '@angular/core';
import {
  FormBuilder,
  FormControl,
  FormGroup,
  Validators,
} from '@angular/forms';
import { IContact } from 'src/app/models/app.models';
import { CustomersService } from 'src/app/services/customers.service';

@Component({
  selector: 'atd-edit-customer',
  templateUrl: './edit-customer.component.html',
  styleUrls: ['./edit-customer.component.scss'],
})
export class EditCustomerComponent implements OnInit {
  public editForm: FormGroup;
  public someContact: IContact; 

  constructor(@Inject(MAT_DIALOG_DATA) public data: IContact,
              private fb: FormBuilder,
              public customersService: CustomersService,
              ) {} 

  public ngOnInit(): void {
    this.editForm = this.fb.group({
      name: [null],
      email: [null,[Validators.email],
    });
  }

  public onEdit(): void {
    this.someContact = this.editForm.value;
    this.someContact.EMailAddresses= [];
    this.someContact.EMailAddresses.push(this.editForm.value.email); <========
    this.customersService.updateContact(this.someContact);
  }
}

JSON looks like this:

export interface IContact {
  id:       string;
  name:     string
  emailId:  string[];
}

Now the issue is:

• When i hit the SAVE button without making any changes in the email input field, The PUT operation is not happening and i am getting this response:

• But if a make some changes in the email input field and hit the SAVE button, The PUT operation works fine.

I am pushing email like this:

this.someContact.EMailAddresses= [];
this.someContact.EMailAddresses.push(this.editForm.value.email); 

What's wrong with the code ??