OIDC forcing access_token

[mdelnegro-lennd]

I have a specific customer that only returns id_token and does not provide access_token nor userinfo_endpoint, I think they pretend to only use the id_token to authenticate with our app. I see the framework forces the IDP to return access_token and userinfo_endpoint. Is this a valid scenario? I was reading the documentation about OIDC and it says the access_token may be optional, which also invalidates the usage of userinfo_endpoint. Any help is appreciated.