mat-tab-group change
<mat-tab-group [(selectedIndex)]="selectedTabIndex" (selectedTabChange)="onTabChanged($event);">
<mat-tab formArrayName="staffMembers" #pft *ngFor="let staffMember of formData.get('staffMembers').controls; let i = index">
<div [formGroupName]="i">
<ng-template mat-tab-label>
{{staffMember.controls.staffMemberId.value}} <a>
</a>
</ng-template>
<div class="form-group">
<label for="name"> Name</label>
<input type="text" class="form-control" id="name" formControlName="name">
</div>
</div>
</mat-tab>
</mat-tab-group>