diff --git a/pkg/connector/client/client.go b/pkg/connector/client/client.go
index 6364bb44..10a722a9 100644
--- a/pkg/connector/client/client.go
+++ b/pkg/connector/client/client.go
@@ -405,14 +405,14 @@ func getTokenValue(pToken *pagination.Token) (int, error) {
 	return value, nil
 }
 
-// onBehalfOfOpts builds the optional on-behalf-of header request option.
-// Returns nil (no extra options) when onBehalfOf is empty, so the same call
-// path works for parent-scope and subuser-scoped requests.
+// onBehalfOfOpts always disables caching: uhttp's cache key ignores the
+// on-behalf-of header, so parent- and subuser-scoped calls would otherwise collide.
 func onBehalfOfOpts(onBehalfOf OnBehalfOf) []uhttp.RequestOption {
-	if onBehalfOf == "" {
-		return nil
+	opts := []uhttp.RequestOption{uhttp.WithNoCache()}
+	if onBehalfOf != "" {
+		opts = append(opts, uhttp.WithHeader(OnBehalfOfHeaderName, string(onBehalfOf)))
 	}
-	return []uhttp.RequestOption{uhttp.WithHeader(OnBehalfOfHeaderName, string(onBehalfOf))}
+	return opts
 }
 
 func (h *SendGridClient) doRequest(
diff --git a/pkg/connector/teammates.go b/pkg/connector/teammates.go
index 0e0be5b7..b3faa7b4 100644
--- a/pkg/connector/teammates.go
+++ b/pkg/connector/teammates.go
@@ -218,15 +218,21 @@ func (u *teammateBuilder) Grants(ctx context.Context, resource *v2.Resource, opt
 		return nil, nil, err
 	}
 
-	// Subuser access grants.
+	logger := ctxzap.Extract(ctx)
+
+	// Subuser access grants. SendGrid returns 403 here for a teammate that
+	// only exists inside a subuser, by design, so treat it as "no access to
+	// report" rather than a fatal error.
 	access, nextToken, err := u.client.GetTeammatesSubAccess(ctx, sgclient.Username(username), &opts.PageToken, sgclient.OnBehalfOf(onBehalfOf))
 	if err != nil {
-		return nil, nil, fmt.Errorf("baton-sendgrid: failed to get teammate subuser access for %s: %w", username, err)
+		if status.Code(err) == codes.PermissionDenied {
+			logger.Debug("baton-sendgrid: subuser_access forbidden for subuser-scoped teammate, skipping", zap.String("username", username), zap.Error(err))
+			access, nextToken = nil, ""
+		} else {
+			return nil, nil, fmt.Errorf("baton-sendgrid: failed to get teammate subuser access for %s: %w", username, err)
+		}
 	}
 
-	logger := ctxzap.Extract(ctx)
-	logger.Info("Teammate grants", zap.String("username", username), zap.Any("COUNT", access))
-
 	for _, subAccess := range access {
 		grants, err := createGrantSubuserFromTeammate(resource, subAccess)
 		if err != nil {
diff --git a/pkg/connector/teammates_test.go b/pkg/connector/teammates_test.go
index cb293971..b01afeba 100644
--- a/pkg/connector/teammates_test.go
+++ b/pkg/connector/teammates_test.go
@@ -83,6 +83,16 @@ type fakeSendGridClient struct {
 	subusers        []models.Subuser
 	// subuserTeammates maps subuser username -> teammates visible to it via on-behalf-of.
 	subuserTeammates map[string][]*models.Teammate
+
+	subAccess    []*models.TeammateSubuser
+	subAccessErr error
+}
+
+func (f *fakeSendGridClient) GetTeammatesSubAccess(_ context.Context, _ sgclient.Username, pToken *pagination.Token, _ sgclient.OnBehalfOf) ([]*models.TeammateSubuser, string, error) {
+	if f.subAccessErr != nil {
+		return nil, "", f.subAccessErr
+	}
+	return pageOneAtATime(f.subAccess, pToken)
 }
 
 func (f *fakeSendGridClient) GetTeammates(_ context.Context, pToken *pagination.Token, onBehalfOf sgclient.OnBehalfOf) ([]*models.Teammate, string, error) {
@@ -110,12 +120,17 @@ func (f *fakeSendGridClient) GetSubuserUsernameByID(_ context.Context, subuserID
 // GetSpecificTeammate backs isParentScopeTeammate's dedup check: onBehalfOf
 // "" means "does this username exist at parent scope", answered against
 // globalTeammates, mirroring the real API's 404-for-missing behavior.
-func (f *fakeSendGridClient) GetSpecificTeammate(_ context.Context, username sgclient.Username, _ sgclient.OnBehalfOf) (*models.TeammateScope, error) {
+func (f *fakeSendGridClient) GetSpecificTeammate(_ context.Context, username sgclient.Username, onBehalfOf sgclient.OnBehalfOf) (*models.TeammateScope, error) {
 	for _, tm := range f.globalTeammates {
 		if tm.Username == string(username) {
 			return &models.TeammateScope{Teammate: *tm}, nil
 		}
 	}
+	for _, tm := range f.subuserTeammates[string(onBehalfOf)] {
+		if tm.Username == string(username) {
+			return &models.TeammateScope{Teammate: *tm}, nil
+		}
+	}
 	return nil, status.Error(codes.NotFound, "teammate does not exist")
 }
 
@@ -263,3 +278,55 @@ func TestTeammateBuilder_List_TeammateRestrictedToMultipleSubusers(t *testing.T)
 
 	require.Empty(t, sub2Resources, "restricted-1 must not be re-emitted under a second subuser with a conflicting ParentResourceId")
 }
+
+func TestTeammateBuilder_Grants_SubuserAccessForbidden(t *testing.T) {
+	client := &fakeSendGridClient{
+		subusers: []models.Subuser{
+			{Id: 1, Username: "sub1", Email: "sub1@example.com"},
+		},
+		subuserTeammates: map[string][]*models.Teammate{
+			"sub1": {
+				{Username: "local-1", Email: "local-1@example.com"},
+			},
+		},
+		subAccessErr: status.Error(codes.PermissionDenied, "403 Forbidden"),
+	}
+
+	sub1ResourceID, err := rs.NewResourceID(subuserResourceType, 1)
+	require.NoError(t, err)
+
+	resource, err := teammateResource(&models.Teammate{Username: "local-1", Email: "local-1@example.com"}, sub1ResourceID, "sub1")
+	require.NoError(t, err)
+
+	tb := newTeammateBuilder(client)
+	grants, results, err := tb.Grants(context.Background(), resource, rs.SyncOpAttrs{PageToken: pagination.Token{}})
+
+	require.NoError(t, err, "a 403 from subuser_access must not abort Grants for a subuser-only teammate")
+	require.Empty(t, grants)
+	require.Equal(t, "", results.NextPageToken)
+}
+
+func TestTeammateBuilder_Grants_SubuserAccessOtherErrorPropagates(t *testing.T) {
+	client := &fakeSendGridClient{
+		subusers: []models.Subuser{
+			{Id: 1, Username: "sub1", Email: "sub1@example.com"},
+		},
+		subuserTeammates: map[string][]*models.Teammate{
+			"sub1": {
+				{Username: "local-1", Email: "local-1@example.com"},
+			},
+		},
+		subAccessErr: status.Error(codes.Unavailable, "upstream unavailable"),
+	}
+
+	sub1ResourceID, err := rs.NewResourceID(subuserResourceType, 1)
+	require.NoError(t, err)
+
+	resource, err := teammateResource(&models.Teammate{Username: "local-1", Email: "local-1@example.com"}, sub1ResourceID, "sub1")
+	require.NoError(t, err)
+
+	tb := newTeammateBuilder(client)
+	_, _, err = tb.Grants(context.Background(), resource, rs.SyncOpAttrs{PageToken: pagination.Token{}})
+
+	require.Error(t, err, "only PermissionDenied should be tolerated, other errors must still propagate")
+}