Free trial Promotion offer not Applying

In my subscription is indicating that a free trial is available. however when the user is going to buy the product, the Purchase screen indicates no free trial, instead they are signing up for the subscription right away without trial period.

My Product object
{
"productId": "xxx",
"subscriptionPeriodUnitIOS": "MONTH",
"description": "Upgrade to Family HQ Basic features",
"introductoryPrice": "",
"title": "Basic Features",
"introductoryPriceSubscriptionPeriodIOS": "",
"introductoryPriceNumberOfPeriodsIOS": "",
"discounts": [
{
"localizedPrice": "$0.00",
"numberOfPeriods": "2",
"type": "SUBSCRIPTION",
"identifier": "xxx-xx",
"paymentMode": "FREETRIAL",
"price": "0",
"subscriptionPeriod": "WEEK"
}
],
"type": "Do not use this. It returned sub only before",
"localizedPrice": "$0.99",
"introductoryPricePaymentModeIOS": "",
"price": "0.99",
"currency": "AUD",
"subscriptionPeriodNumberIOS": "1"
}