DEleted function in request and changed the way the controller uses it,

app/Http/Controllers/TeamController.php

@@ -8,6 +8,7 @@ use App\Http\Requests\UpdateTeamMembersRequest;
 use App\Models\Team;
 use App\Models\User;
 use Illuminate\Http\RedirectResponse;
+use Illuminate\Support\Arr;
 use Inertia\Inertia;
 use Inertia\Response;
 
@@ -49,7 +50,15 @@ class TeamController extends Controller
 
     public function updateMembers(UpdateTeamMembersRequest $request, Team $team): RedirectResponse
     {
-        $this->projectPermissionService->syncTeamMembers($team, $request->userIds());
+        $validated = $request->validated();
+
+        $userIds = collect(Arr::get($validated, 'user_ids', []))
+            ->map(fn (mixed $userId): int => (int) $userId)
+            ->unique()
+            ->values()
+            ->all();
+
+        $this->projectPermissionService->syncTeamMembers($team, $userIds);
 
         return to_route('admin.teams.index')
             ->with('status', "{$team->name} members were updated.");