Hi @khawmingsheng,
Thank you for your reply.
I have tested it myself and was able to successfully trigger the Post-Login Action flow.
Could you please try using the built-in Actions debugger to see if the Action script has any issues?
I would also recommend using console.log() statements in your Action script with the Real-time Webtask Logs Extension to track the state of your Action.
If you are still having issues, could you please share an example of your Action script with sensitive data removed with me?
Thanks,
Rueben