SAML2 Connexion: Unexpected System Error (Reference#: 3621-3573)

Hi to the community!

I've added the Box Application from the Zoho marketplace.

Everything seems to be well configured (metadata, connexion URL, Certificate...) but when I am trying to access box.com through the SSO (https://sso.services.box.net/sp/ACS.saml2) I get this error :

Using a SAML debugger I can see the error but I can't fix it, here the HTTP data:

POST https://sso.services.box.net/sp/ACS.saml2 HTTP/1.1 Host: sso.services.box.net User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:109.0) Gecko/20100101 Firefox/117.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8 Accept-Language: fr,fr-FR;q=0.8,en-US;q=0.5,en;q=0.3 Accept-Encoding: gzip, deflate, br Content-Type: application/x-www-form-urlencoded Content-Length: 5337 Origin: https://one.zoho.eu Alt-Used: sso.services.box.net Connection: keep-alive Referer: https://one.zoho.eu/ Upgrade-Insecure-Requests: 1 Sec-Fetch-Dest: document Sec-Fetch-Mode: navigate Sec-Fetch-Site: cross-site

HTTP/3.0 500 Internal Server Error date: Sat, 23 Sep 2023 08:42:46 GMT content-type: text/html;charset=utf-8 content-length: 1602 referrer-policy: origin pragma: no-cache cache-control: no-cache, no-store strict-transport-security: max-age=31536000 via: 1.1 google alt-svc: h3=":443"; ma=2592000,h3-29=":443"; ma=2592000 X-Firefox-Http3: h3

How can I make it work? Thank you

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