Cant buy diamond for mobile legends

Hi there, Antonet!

Thanks for visiting the Apple Support Communities. It sounds like you are having trouble making in-app purchases in the game Mobile Legends. I'm happy to help!

The information below from Buy additional app features with in-app purchases and subscriptions - Apple Support describes what to do if you have trouble with in-app purchases:

"If you have trouble making an in-app purchase, make sure that your payment information is up to date. For any other issues with in-app purchases, you can report a problem."

Cheers!