Not being able to purchase coins could be due to several reasons:
Your internet connection must be stable to complete purchases. It's recommended to use Wi-Fi or at least a 3G/4G/LTE/5G connection when purchasing coins.
There may be temporary issues with the app store where the game was downloaded. All in-app purchases are processed through the store, and there is a chance the store might not respond to in-app purchases.
Your payment information might need to be updated, which could prevent you from completing in-app purchases. The store may not accept the payment method you're using. To view available payment methods, check the app store's payment options.
If you're still unable to make a purchase, please get in touch with us.
To contact us, click on the "Contact Us" button located in the upper right corner of the screen, and we will gladly assist you further.