Why can’t I buy robux with my id credit balance

Hello Chris9337!

This is an Apple Recommended reply to someone having the same issue as you:

Your screenshot tells you what you need to do i.e. contact iTunes Support. If, for some reason, you haven't done as instructed and contacted iTunes Support you should do so, we (i.e. fellow users) can't help you :

- go to Choose your country or region - Official Apple Support

- click on your country's flag (the country where you are, and which is therefore the country on your account)

- click on Contact Support towards the top right

- click on Get Help under 'Talk To Us'

This excerpt should also help you:

This is a user to user support forum. We don't have access to your account to see what the issue is. Try:

• If your Apple ID is locked or disabled - Apple Support
• If your payment method is declined, or you have a billing issue in the App Store or iTunes Store - Apple Support
• Prevent in-app purchases from the App Store - Apple Support
• Contact iTunes - Official Apple Support

I hope you found this helpful. Good Luck!

Roblox cannot be purchased with a credit card balance. To purchase Robux, you'll need to add a valid payment method, such as a credit or debit card, to your account.

Click here and ask the iTunes Store staff for assistance. Only they will know.

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