ASP.NET Core Blazor + EF error

General error: Invalid operation. The connection is closed.

var department = await PrrojectDBService.GetDepartmentByIdWithRelatedData(selectedDepartmentID);

public async Task<Project.Models.ProjectDB.Department> GetDepartmentByIdWithRelatedData(int departmentId)
    {
        try
        {
            Console.WriteLine("Starting to fetch department data for department ID: " + departmentId);

            var department = await Context.Departments
                .Include(d => d.DepartmentNotes)
                .Include(d => d.DepartmentInfrastructures)
                .Include(d => d.DeviceInstallationStatuses)
                .FirstOrDefaultAsync(d => d.departmentID == departmentId);

            Console.WriteLine("Successfully retrieved department data for department ID: " + departmentId);

            return department;
        }
        catch (DbException dbEx)
        {
            Console.WriteLine("Database-related error: " + dbEx.Message);
            throw;

        }
        catch (Exception ex)
        {
            Console.WriteLine("General error: " + ex.Message);
            throw; 
        }
    }