Hi @warlikcookie82, thanks for flagging the issue! If the Roblox settings are not showing up at the iOS level, the easiest way to resolve this is to reinstall the app to get the notifications permissions prompt. After you reinstall, you will need to log in, then relaunch to app to get the permissions prompt.
Just a heads up that reinstalling will log you out of all your accounts so make sure you can log back into your accounts.