Mongoose join 2 collections based on 2 conditions within $match

i want to join employees collections and salaries collections based on some conditions

Employee.aggregate([
    {
      $match: {
        nameAR: "عاصم ماجد شوشاري",
      },
    },
    {
      $lookup: {
        from: "salaries",
        let: { month: "$month", year: "$year" },
        localField: "_id",
        foreignField: "employeeId",
        pipeline: [
          {
            $match: {
              $expr: {
                $eq: ["$month", "4"],
                $eq: ["$year", "2022"],

              },
            },
          },
        ],
        as: "report",
      },
    },
  ]).exec(function (err, students) {
    res.status(200).json(students);
  });

the conditions are month equal to 4 and year equal to 2022, but what happens is it will return document when month is equal to 4 or year equal to 2022 so when any of the conditions specified is true, but i want only when both of them are true, how to solve it ?