'Material Autocomplete with FormGroup

I have a formGroup that uses the Material Autocomplete component/input to select a Customer with a name and ID. I am able to select and POST fine. How do I load the Customer name in the same Autocomplete component on a GET by providing the ID from the formGroup?

<input type="text" placeholder="Enter Name" matInput [matAutocomplete]="auto"
            formControlName="MarinaCustomerId">
          <mat-autocomplete #auto="matAutocomplete" autoActiveFirstOption [displayWith]="displayFunction"
            (optionSelected)="getCustomerVessels();resetVessel()">
            <mat-option *ngFor="let option of filteredOptions | async" [value]="option">
              <span>{{option.LastName + ', ' + option.FirstName}}</span>
            </mat-option>
          </mat-autocomplete>


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