Error while requesting server, received a non successful HTTP code with response Body: {"error":"invalid_grant","error_description":"user_not_found"}

Hey @Veerabhadra, 

If you are using JWT Grant to execute your authentication process, please be sure that you are providing a valid User ID on “sub” parameter in your assertion payload. 

If the User ID value is incorrect (wrong UUID, targeting a user in another enviroment or anything like) it might trigger this user_not_found error message. 

Please check if this is enough to fix your issue. 

😎