PayPal subscription approval link throws an error - paypal

Question

I am using Postman for this. It generates the following link https://www.sandbox.paypal.com/webapps/billing/subscriptions?ba_token=BA-79D58732NX9686808 however when I visit it, I see the following error message:
Things don't appear to be working at the moment. Please try again later.
After getting a token, I created a product then I created a plan and finally, I created a subscription. Am I missing something?
Here is what I have done and the response I have received:
Create Product:
{
"id": "FF-SUBSCRIPTION-SERVICE-BASIC-T1",
"name": "Subscription Basic Plan",
"description": "Basic Service Subscription Plan",
"type": "SERVICE"
}
Create Plan:
{
"product_id": "FF-SUBSCRIPTION-SERVICE-BASIC-T1",
"name": "Subscription Basic Plan",
"description": "Basic Service Subscription Plan",
"status": "ACTIVE",
"payment_preferences": {
"auto_bill_outstanding": true,
"payment_failure_threshold": 5
},
"billing_cycles": [
{
"frequency": {
"interval_unit": "MONTH",
"interval_count": 1
},
"tenure_type": "TRIAL",
"sequence": 1,
"total_cycles": 1
},
{
"frequency": {
"interval_unit": "MONTH",
"interval_count": 1
},
"tenure_type": "REGULAR",
"sequence": 2,
"total_cycles": 0,
"pricing_scheme": {
"fixed_price": {
"value": "14.99",
"currency_code": "USD"
}
}
}
]
}
Create Subscription:
{
"plan_id": "P-1DM03386YX156733CMNORKJQ",
"quantity": "1",
"shipping_amount": {
"currency_code": "USD",
"value": "14.99"
},
"subscriber": {
"name": {
"given_name": "John",
"surname": "Doe"
},
"email_address": "sb-xahhi21980157#personal.example.com"
}
},
"application_context": {
"brand_name": "X",
"locale": "en-US",
"shipping_preference": "SET_PROVIDED_ADDRESS",
"user_action": "SUBSCRIBE_NOW",
"payment_method": {
"payer_selected": "PAYPAL",
"payee_preferred": "IMMEDIATE_PAYMENT_REQUIRED"
},
"return_url": "https://www.example.com/returnUrl",
"cancel_url": "https://www.example.com/cancelUrl"
}
}
The response I receive is as follows:
{
"status": "APPROVAL_PENDING",
"id": "I-N6DFDLTU8HK9",
"create_time": "2022-10-29T11:58:28Z",
"links": [
{
"href": "https://www.sandbox.paypal.com/webapps/billing/subscriptions?ba_token=BA-79D58732NX9686808",
"rel": "approve",
"method": "GET"
},
{
"href": "https://api-m.sandbox.paypal.com/v1/billing/subscriptions/I-N6DFDLTU8HK9",
"rel": "edit",
"method": "PATCH"
},
{
"href": "https://api-m.sandbox.paypal.com/v1/billing/subscriptions/I-N6DFDLTU8HK9",
"rel": "self",
"method": "GET"
}
]
}