paypal subscription payment doesnt open on django

I am trying to make a subscription using django and paypal payment. I'm trying to complete a course.

I have made my plans in business sandbox. I've used the code it gives you after making plans and turn them on. I simply copied and pasted the code into my page. It is a local server.

When I click on Paypal buttons they open a blank page. I checked my Inspect and it shows these each time I click on links.

First error:

create_order_error Object { err: 'Create Subscription Api response error:\n\n{\n    "name": "RESOURCE_NOT_FOUND",\n    "message": "The specified resource does not exist.",\n    "debug_id": "f913475242396",\n    "details": [\n        {\n            "issue": "INVALID_RESOURCE_ID",\n            "description": "Requested resource ID was not found."\n        }\n    ],\n    "links": [\n        {\n            "href": "https://developer.paypal.com/docs/api/v1/billing/subscriptions#RESOURCE_NOT_FOUND",\n            "rel": "information_link",\n            "method": "GET"\n        }\n    ]\n}', timestamp: "1717846131222", referer: "www.sandbox.paypal.com", sdkCorrelationID: "0b604ba725142", sessionID: "uid_ffb7a1abe3_mte6mjc6mjk", clientID: "AZDxjDScFpQtjWTOUtWKbyN_bDt4OgqaF4eYXlewfBP4-8aqX3PiV8e1GWU6liB2CUXlkA59kJXE7M6R", env: "sandbox", buttonSessionID: "uid_ef868db584_mte6mjg6ndg", buttonCorrelationID: "f3594475ad16f", token: null }

Second error:

Uncaught Error: Create Subscription Api response error:{"name": "RESOURCE_NOT_FOUND","message": "The specified resource does not exist.","debug_id": "f693155709fe0","details": [        {"issue": "INVALID_RESOURCE_ID","description": "Requested resource ID was not found."        }    ],"links": [        {"href": "https://developer.paypal.com/docs/api/v1/billing/subscriptions#RESOURCE_NOT_FOUND","rel": "information_link","method": "GET"        }    ]}

Last one is a warning:

click_initiate_payment_reject Object { err: 'Create Subscription Api response error:\n\n{\n    "name": "RESOURCE_NOT_FOUND",\n    "message": "The specified resource does not exist.",\n    "debug_id": "f693155709fe0",\n    "details": [\n        {\n            "issue": "INVALID_RESOURCE_ID",\n            "description": "Requested resource ID was not found."\n        }\n    ],\n    "links": [\n        {\n            "href": "https://developer.paypal.com/docs/api/v1/billing/subscriptions#RESOURCE_NOT_FOUND",\n            "rel": "information_link",\n            "method": "GET"\n        }\n    ]\n}\nwindow.spb</ne/<@https://www.sandbox.paypal.com/smart/buttons?style.label=subscribe&style.layout=vertical&style.color=gold&style.shape=rect&style.tagline=false&style.menuPlacement=below&allowBillingPayments=true&applePaySupport=false&buttonSessionID=uid_5e90dddfde_mte6mzi6mzk&buttonSize=huge&customerId=&clientID=AZDxjDScFpQtjWTOUtWKbyN_bDt4OgqaF4eYXlewfBP4-8aqX3PiV8e1GWU6liB2CUXlkA59kJXE7M6R&clientMetadataID=uid_ffb7a1abe3_mte6mjc6mjk&commit=true&components.0=…', timestamp: "1717846381227", referer: "www.sandbox.paypal.com", sdkCorrelationID: "0b604ba725142", sessionID: "uid_ffb7a1abe3_mte6mjc6mjk", clientID: "AZDxjDScFpQtjWTOUtWKbyN_bDt4OgqaF4eYXlewfBP4-8aqX3PiV8e1GWU6liB2CUXlkA59kJXE7M6R", env: "sandbox", buttonSessionID: "uid_5e90dddfde_mte6mzi6mzk", buttonCorrelationID: "f332954730109", token: null }

I have added this line to my settings.py.

SECURE_CROSS_ORIGIN_OPENER_POLICY = 'same-origin-allow-popups'

Weird thing is before and after adding this line result was the same.

before adding this when I click on buttons, they open a blank page and it closes after a second.after adding this line I restarted my server and reloaded the page but everything is the same.

I have checked my account is my sandbox mode. also I am using VPN because the paypal doesnt load without it.