Hi, 

We setup a managed account and enabled the auto change password function.

It seems to work for all other service but the same account password that is used in 

SecurityTokenServiceApplicationPool that run on WFE is not updated.

Is there anything we need to check for this?

Can you check if SecurityTokenServiceApplicationPool  is running on local service

When you run the change password function. can you share the ULS log in vebose mode so we can check for errors

Do we see any error in event viewer

its running on sp_farm

sp_farm is added on managed account

when it run, all other service even SecurityTokenServiceApplicationPool on APP server is updated.

for the logs I will need time to get it.

Thanks