API Connector show error when connect to another bubble app

When I tried to connect to another bubble app by workflow API
Here is API workflow setting in app A, I have 1 parameter name email

Here is setting on API Connector in app B

When I tried to initialize call, it showing Error code 400

But when I tried by another software like Rest Client, it work well. I can get data return from Workflow API.
I tried to change Json body with many different type, but it still does not work with API connector.
Please help.

I found a problem.
Body type should be Form-Data instead of Json