There could be several reasons why you're unable to purchase coins:
• Ensure your internet connection is stable. We recommend using Wi-Fi or at least a 3G/4G/LTE/5G connection while making purchases.
• There may be a temporary issue with the app store where the game was downloaded. All in-game purchases go through the app store, and sometimes it may not respond correctly.
• Your payment information might need updating, or the store may not accept your chosen payment method. Check the accepted payment methods in your app store: Accepted Google Play payment methods
• If you're still unable to make a purchase, please contact us.
• To reach us, tap the Settings button in the top left corner of the screen and click on the "Customer Service" button in the interface to contact us. We’ll be happy to assist you further!