i am unable to purchase icloud storage even my payment method is working when buying apps on appstore. Why? kindly educate me regarding this issue.

Hi theaqibism,

We appreciate you reaching out to us.

We’d like to gather additional details that may help us be in a better position to assist you.

1. Have you had the chance to restart your iPhone? Restart your iPhone - Apple Support
2. Have you had the chance to try a different Wi-Fi network?
3. Have you had the chance to make sure that your device is not using a VPN?
4. Also, do you have a different Apple device that is signed in to the same Apple ID? If yes, are you experiencing a similar issue with your other device? These details can help us in isolating the issue.

First, let's make sure that you are using a payment method that is available for your country or region.

Payment methods that you can use with your Apple ID - Apple Support

Did you use the same steps below to add your payment method?

1. "Open the Settings app.
2. Tap your name.
3. Tap Media & Purchases, then tap View Account. You might be asked to sign in with your Apple ID.
4. Tap Manage Payments.
5. Tap Add Payment Method.

 6. Enter the payment method details, then tap Done."

You can use the article below as a reference.

Add a payment method to your Apple ID - Apple Support

Have you had the chance to make sure that your payment method is up to date?

1. "Open the Settings app.
2. Tap your name.
3. Tap Payment & Shipping. You might be asked to sign in with your Apple ID.
4. Tap Add Payment Method, enter the new payment method, then tap Done.
5. Tap Edit.
6. Tap the red delete button next to the old payment method, then tap Delete."

You can use the article below as a reference.

If you need to change or update your Apple ID payment method - Apple Support

If everything seems to be in order, please team up with our Billing experts.

Our Billing experts are in a better position to provide you assistance with billing-related issues.

You can use this link to reach out to them: Contact - Official Apple Support

Take care!