Hi there @shengnan.qiu welcome to the community!
The 500 leads me to believe there is an issue with the request itself - Admittedly, the error isn’t very helpful!
What happens if you omit the redirect_uri - I am going off the following doc:
You mean the configuration “redirect_uri” is wrong?
However, I use a similar configuration in the test environment. It is true that this error occurs, and 200 is returned normally.