Cant purchase robux on xbox roblox app.

Hello, is the roblox app from the Xbox Home menu mean the Roblox app from the Xbox app?
and what do you mean by "Log into the account where the Robux was purchased or earned"

My name is Fernando I'm an independent consultant, I'm happy to help.

Open the Roblox app from the Xbox Home menu. Log into the account where the Robux was purchased or earned. Once you're in the Roblox home menu, go to the Robux menu. You can see your Robux balance next to My Balance in the bottom left corner.

I hope I helped and see you soon.

When you purchase the robux from the Xbox site, you are actually just buying the robux for the Xbox version of the game. For the PC version you need to purchase direct from Roblox or by purchasing a robux card from your local or online game store.

For PC, you will have to purchase Robux directly from Roblox themselves, as you say the Robux from the Microsoft store is for Xbox only.

https://www.roblox.com/upgrades/robux

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