Single Logout Out throws error - Unable to get SsoTokenManager / Unknown JWT

I am trying to logout after 7 minutes of inactivity from our Application using Spring Boot - to ForgeRock OIDC logout with URL:

http://host:port/openam/oauth2/TestRealm/connect/endSession?id_token_hint=

Issue: Getting different errors at different points:
1 - {“error_description”:“Unable to get SsoTokenManager”,“error”:“server_error”}
2- { “error_description”: “Unknown JWT”, “error”: “bad_request”}

I am suspecting the issue to be ForgeRock session has already timeout, i.e.
our application timeout > forgerock session timeout

References:

Endpoint to terminate authenticated end-user sessions, as per OpenID Connect Session Management 1.0 - draft 5.

Please help with what configurations / where to check?