Hi, I am Van. I'll be glad to assist you today.
May I verify if you have tried reinstalling the app? If the game is currently installed, click the Windows Start menu, then click Settings. Go to Apps > Installed apps, search for Roblox, click the 3-dot option, then click Uninstall. Once done, reboot the device.
Afterward, open the Microsoft Store, search for Roblox, then click Install.
Please feel free to reach out if you require any further assistance. I'm here to help.