diff --git a/internal/oidc/auth/auth_handler.go b/internal/oidc/auth/auth_handler.go
index 8fbcf5751..d74ad0947 100644
--- a/internal/oidc/auth/auth_handler.go
+++ b/internal/oidc/auth/auth_handler.go
@@ -7,11 +7,11 @@ package auth
 import (
 	"fmt"
 	"net/http"
-
-	"github.com/ory/fosite/handler/openid"
+	"time"
 
 	"github.com/ory/fosite"
-
+	"github.com/ory/fosite/handler/openid"
+	"github.com/ory/fosite/token/jwt"
 	"golang.org/x/oauth2"
 	"k8s.io/klog/v2"
 
@@ -55,7 +55,22 @@ func NewHandler(
 			return err
 		}
 
-		_, err = oauthHelper.NewAuthorizeResponse(r.Context(), authorizeRequester, &openid.DefaultSession{})
+		// Grant the openid scope (for now) if they asked for it so that `NewAuthorizeResponse` will perform its OIDC validations.
+		for _, scope := range authorizeRequester.GetRequestedScopes() {
+			if scope == "openid" {
+				authorizeRequester.GrantScope(scope)
+			}
+		}
+
+		now := time.Now()
+		_, err = oauthHelper.NewAuthorizeResponse(r.Context(), authorizeRequester, &openid.DefaultSession{
+			Claims: &jwt.IDTokenClaims{
+				// Temporary claim values to allow `NewAuthorizeResponse` to perform other OIDC validations.
+				Subject:     "none",
+				AuthTime:    now,
+				RequestedAt: now,
+			},
+		})
 		if err != nil {
 			klog.InfoS("authorize response error", "err", err, "details", fosite.ErrorToRFC6749Error(err).ToValues())
 			oauthHelper.WriteAuthorizeError(w, authorizeRequester, err)
diff --git a/internal/oidc/auth/auth_handler_test.go b/internal/oidc/auth/auth_handler_test.go
index 1da217a96..399605e39 100644
--- a/internal/oidc/auth/auth_handler_test.go
+++ b/internal/oidc/auth/auth_handler_test.go
@@ -51,6 +51,13 @@ func TestAuthorizationEndpoint(t *testing.T) {
 			}
 		`)
 
+		fositePromptHasNoneAndOtherValueErrorQuery = map[string]string{
+			"error":             "invalid_request",
+			"error_description": "The request is missing a required parameter, includes an invalid parameter value, includes a parameter more than once, or is otherwise malformed\n\nParameter \"prompt\" was set to \"none\", but contains other values as well which is not allowed.",
+			"error_hint":        "Parameter \"prompt\" was set to \"none\", but contains other values as well which is not allowed.",
+			"state":             "some-state-value",
+		}
+
 		fositeMissingCodeChallengeErrorQuery = map[string]string{
 			"error":             "invalid_request",
 			"error_description": "The request is missing a required parameter, includes an invalid parameter value, includes a parameter more than once, or is otherwise malformed\n\nThis client must include a code_challenge when performing the authorize code flow, but it is missing.",
@@ -118,6 +125,7 @@ func TestAuthorizationEndpoint(t *testing.T) {
 		Clients:        map[string]fosite.Client{oidc.PinnipedCLIOIDCClient().ID: oidc.PinnipedCLIOIDCClient()},
 		AuthorizeCodes: map[string]storage.StoreAuthorizeCode{},
 		PKCES:          map[string]fosite.Requester{},
+		IDSessions:     map[string]fosite.Requester{},
 	}
 	hmacSecret := []byte("some secret - must have at least 32 bytes")
 	require.GreaterOrEqual(t, len(hmacSecret), 32, "fosite requires that hmac secrets have at least 32 bytes")
@@ -415,6 +423,22 @@ func TestAuthorizationEndpoint(t *testing.T) {
 			wantLocationHeader: urlWithQuery(downstreamRedirectURI, fositeMissingCodeChallengeMethodErrorQuery),
 			wantBodyString:     "",
 		},
+		{
+			// This is just one of the many OIDC validations run by fosite. This test is to ensure that we are running
+			// through that part of the fosite library.
+			name:               "prompt param is not allowed to have none and another legal value at the same time",
+			issuer:             issuer,
+			idpListGetter:      newIDPListGetter(upstreamOIDCIdentityProvider),
+			generateState:      happyStateGenerator,
+			generatePKCE:       happyPKCEGenerator,
+			generateNonce:      happyNonceGenerator,
+			method:             http.MethodGet,
+			path:               modifiedHappyGetRequestPath(map[string]string{"prompt": "none login"}),
+			wantStatus:         http.StatusFound,
+			wantContentType:    "application/json; charset=utf-8",
+			wantLocationHeader: urlWithQuery(downstreamRedirectURI, fositePromptHasNoneAndOtherValueErrorQuery),
+			wantBodyString:     "",
+		},
 		{
 			name:               "state does not have enough entropy",
 			issuer:             issuer,
@@ -526,9 +550,6 @@ func TestAuthorizationEndpoint(t *testing.T) {
 		rsp := httptest.NewRecorder()
 		subject.ServeHTTP(rsp, req)
 
-		t.Logf("response: %#v", rsp)
-		t.Logf("body: %q", rsp.Body.String())
-
 		require.Equal(t, test.wantStatus, rsp.Code)
 		requireEqualContentType(t, rsp.Header().Get("Content-Type"), test.wantContentType)
 
diff --git a/internal/oidc/oidc.go b/internal/oidc/oidc.go
index a03c86d04..8d319c1d1 100644
--- a/internal/oidc/oidc.go
+++ b/internal/oidc/oidc.go
@@ -44,7 +44,7 @@ func FositeOauth2Helper(oauthStore interface{}, hmacSecretOfLengthAtLeast32 []by
 		nil, // hasher, defaults to using BCrypt when nil. Used for hashing client secrets.
 		compose.OAuth2AuthorizeExplicitFactory,
 		// compose.OAuth2RefreshTokenGrantFactory,
-		// compose.OpenIDConnectExplicitFactory,
+		compose.OpenIDConnectExplicitFactory,
 		// compose.OpenIDConnectRefreshFactory,
 		compose.OAuth2PKCEFactory,
 	)
diff --git a/internal/oidc/provider/manager/manager.go b/internal/oidc/provider/manager/manager.go
index fbee5db41..229dd3751 100644
--- a/internal/oidc/provider/manager/manager.go
+++ b/internal/oidc/provider/manager/manager.go
@@ -74,6 +74,7 @@ func (m *Manager) SetProviders(oidcProviders ...*provider.OIDCProvider) {
 			Clients:        map[string]fosite.Client{oidc.PinnipedCLIOIDCClient().ID: oidc.PinnipedCLIOIDCClient()},
 			AuthorizeCodes: map[string]storage.StoreAuthorizeCode{},
 			PKCES:          map[string]fosite.Requester{},
+			IDSessions:     map[string]fosite.Requester{},
 		}
 		oauthHelper := oidc.FositeOauth2Helper(oauthStore, []byte("some secret - must have at least 32 bytes")) // TODO replace this secret