Bought robux using xbox store, never got them because i dont have a xbox roblox account.

what do you mean by claimed and how do you claim it

I play the game on PC, I never had an XBox which I think is the problem.

Hi, Mahdi G. I’m Arturo, and I’ll be glad to provide some assistance with your inquiry today.

Would I know if you play Roblox only on PC, or do you play the game on Xbox?

It is important to point out that Robux available on the Xbox store can be claimed and appear only on the Xbox version of the game.

Punish your boy and tell him to NEVER make purchases again without allowance.. And I doubt you can get the money back because your son would've payed for the ROBLOX virtual currency known as robux and he as probably bought clothing and game passes with these
robux so nor Microsoft or the ROBLOX team will be able to get the robux back because they are unable to take the bought items off his ROBLOX account. Also change the settings on your Xbox to make it require a passkey or your password when making a purchase!

will i need to buy xbox live gold to redeem the robux if its from microsoft store?

can i use my microsoft balance for ingame shop?

Turns out you will need xbox live TO PLAY ONLINE which means:

you dont beed live to redeem the robux, just login and launch the game on xbox with the account of the purchase and to log into the roblox account you want the robux to go to.