"error": "invalid_grant"

Airel.J.35

Hi, I'm trying to use lti 1.3 and I want to authenticate using 

I created a new client id when i register my tool

However when I try to consume the service I receive an error:

{   
"error": "invalid_grant",    "error_description": "Error validating assertion: Unknown validation exception"
}

Do I have to do any extra config?

this is what my jwt looks like
https://jwt.io/#debugger-io?token=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6IjZkOTYxMGM4NWZmZDIzYzY3ZDE4MWE5M2Q3ZmY5MWVkIn0.eyJpc3MiOiIzZTBjOTZjNS0yZTM4LTRlZTAtYjkyNC0wOTg1YWIwZWExYjUiLCJhdWQiOiJodHRwczovL2FwaS5icmlnaHRzcGFjZS5jb20vYXV0aC90b2tlbiIsImp0aSI6IjRjYTNiMTFjZDg0MzdmYjVjOGU3YmU3NTdjMDZiNDQyIiwiaWF0IjoxNzEzNzk3OTMyLCJzdWIiOiIzZTBjOTZjNS0yZTM4LTRlZTAtYjkyNC0wOTg1YWIwZWExYjUiLCJuYmYiOjE3MTM3OTc5MzIsImV4cCI6MTc0NTMzNzUzMn0.HSyVVA8p1KRHt66_8bAD7NRwDyRegDBygMM6t9kVq1Fn1-CWxRh_YE0qizT8puEuFNt7mXjoSJz71H2_9qr3UtDSI_erufDpL5LflvdSMOfQuuXHayQMl47qh9rY5jesxskuTIzUrRbOsKUi_VTyg11N7ko5JLznxWoYHFbcAMa-JdlXURvcYXT6rLmxx9rCnJyUYHAmru-7gEJnby41IaaRKWvqNz2vF8kT-y300-v9XEFww9KmgrrBzUTVVb4aDYIF5Jf_cWvk5zjqxcVqc-CywCEQJH6A6g9REp7TbU4P-Kw5_up_J_N9QgGstXj5GrIZWqBK31o5gfrGPCXtuw

Joseph.W.983

Hi Airel, does this link help at all? https://community.d2l.com/brightspace/kb/articles/23730-about-lti-1-3-launch-and-authentication I might need some more details to help you out.