[Vuejs]-V-select multiple not setting value

i am guessing its a reactivity issue.
try this.$set(this.customer, 'fname', customer.first_name)
checkout their docs on reactivity

If you’re using Vuetify v-select, you need to use :items instead of :options

   <v-select
      multiple
      :searchable="false"
      label="phone"
      :disabled="appointment.phone_in_notes"
      :no-drop="true"
      :items="customerPhones"
      :value="customerPhones"
    ></v-select>