thank you very much it's very helpful.
We are using QA environment for automation test.
For above test account, could user password set to never expire?
We can close this ticket. Finally identified it's our code issue, somewhere try the exception and convert it to some other type's exception.
We can close ticket, since I disabled the dynamic claim feature per AI bot's suggestion
Can close this ticket. I gave two short of lock grace period, and I also add a loop / sleep try n times to acquire the lock. Then the code works
Copy Response is exact the text as shown above, I throw the User Friendly Exception at the first line of a AppService method for testing. The response status code is 400 
The backend is as above in Api project. The client angular network tab, response is plain error message.
