Unable to connect to Diablo3 Us server

Hi,

After patch 2.4.1, I can no longer play D3 on Us server using BP. Keep getting this error

"You have attempted to connect to an invalid server. Please exit the game, then try logging in again (Code 520)".

I am sure that i wasn't trying to play the D3's ptr server. No issue connecting to Asia server using BP though. Also can connect to both US and Asia if not using BP.

Thank you