Incorrect microsoft balance is showed when child trys to purchase stuff from roblox

Are you on a child account and/or are you trying to make the purchase with a Microsoft account balance?

It's actually very easy. You just need to do the following steps.

Ensure your Microsoft account balance has enough funds to cover the purchase.

Navigate to the Roblox game or the Microsoft Store (depending on your device).

When making the purchase, select your Microsoft account balance as the payment method.

Hi and thanks for reaching Microsoft Xbox gamer's community. My name is Josef.
I'm an Independent Advisor and a Microsoft Xbox user like you.

Hope you're doing great today Hyperflo

So, you want to purchase Roblox premium as soon as you redeem the points. Right?

You can do it, you can make in-game purchases with Microsoft balance.

According to a similar thread, it seems you need to do it on the Xbox Roblox version to pay with balance in case the Roblox Microsoft Store doesn't give you the option to pay with balance

https://answers.microsoft.com/en-us/windows/for...

If you have further questions feel free to ask, greetings from another Microsoft user

If you're trying to purchase it with your Microsoft account balance, or you're on a child account, you'll have to make the purchase from a 360 console. Otherwise, you'd need a credit card or Paypal on file to make the purchase.

Hello Halfest, this is Manuela!. I'm an Independent Advisor and community user like you ready to assist with this.
Not a Microsoft employee.

I'm afraid to say that at the moment is not possible to use Microsoft balance to purchase Robux on the PC version of Roblox.
As you say, you can purchase robux with balance only on Xbox consoles for the Roblox Xbox edition