Need to show *ngIf directive element in UI only after API response

I have a validation API and based on the error, I'm highlighting the field, but before validation is completed it is showing no errors only. How can restrict it.

My HTML-

                </mat-header-cell>
                <mat-cell style="max-width: 6%;" *matCellDef="let element; let i=index">
                    <button *ngIf="!element.HAS_ERROR" mat-icon-button>
                        <span class="material-icons" style="color: #55bd55;">done</span>
                    </button>// this element is showing till before validation API response. but I need to restrict till API response.
                  
                    <button mat-icon-button color="warn" *ngIf="element.HAS_ERROR" (click)="openConflictDialog(i)">
                        <span class="material-icons">
                          info
                        </span>
                    </button>
                </mat-cell>
            </ng-container>

TS-

 asyncReq(element:any){
      this.conflictData = null;
        //For all day
        let startDate:any;
        let endDate:any;
        startDate = this.easternToUtc.transform(moment(element.START_TIME).format('YYYY/MM/DD 00:00:00'), this.selectedTimeZone);
        endDate =  this.easternToUtc.transform(moment(element.END_TIME).format('YYYY/MM/DD 23:59:59'), this.selectedTimeZone);
      return  new Promise((resolve, reject) => {
        
        let requestPayload = zipObj(['USER_ID','AMENITY_TYPE_ID','AMENITY_ID','START_TIME', 'END_TIME', 'BUILDING_ID', 'AMENITY_NAME'],
        [element.USER_ID,element.AMENITY_TYPE_ID,element.AMENITY_ID,startDate,
          endDate, element.BUILDING_ID, element.AMENITY_NAME]);
        this.http.post(`${environment.reservationValidation}`, requestPayload).pipe(take(1)).subscribe(e => {
          }, (e:any) => {
            console.log(e);
            element.ERROR_TYPE = e.error?.message;
            element.HAS_ERROR = true;
            this.conflictData = e.error?.reservationdata;
          })
        })
    }