So what can I do with my BAT in my Brave Rewards

That tells you exactly what I said. Brave is the one preventing the connection. You can still go to uphold.com and create an account or sign in to an existing one. Only issue is you can’t link Brave to it and withdraw BAT. Which is why I also said:

And explicitly mentioned:

And like your notice says, “not supported for Brave Rewards verification.” It doesn’t say Uphold doesn’t support you. It’s why I said, it’s not that the two sites don’t support Malaysia, it’s that Brave isn’t supporting Malaysia and many other countries for the moment.