Why won’t it use money from Apple balance?

Why won’t it use money from Apple balance?

See -> Add a payment method to your Apple ID -> Add a payment method to your Apple ID – Apple Support (UK)

• if you want to use your Apple ID balance, you need to set your Apple ID balance as your default payment.

If you update your payment method or add funds to your Apple ID balance, It would take about 1 to 3 business days in order to process.

If you're still unable to update your payment method, Contact Apple Support.

SunflowerCCG Said:

"Why won’t it use money from Apple balance?"

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Using Money And Account Balance:

The Apple Account balance is withdrawn from first. Once it is zeroed-out, it comes out of your money through your method of payment.

Or is it something else?