I’m trying to use Azure AD B2C for authentication for my app. However, understanding when it is set-cookie for the browser seems difficult. I would like to receive answers from people knowledgeable about this issue

I tried to use the B2C API to authenticate login, but it seems that it only supports ROPC, but not using user flow Sign In.Is the moment it is set-cookie for the browser is the moment B2C returns the code to the browser side?