I get an error:
Error CS1503 Argument 1: cannot convert from 'method group' to 'System.Action<byte, byte, bool[*,*]>'

This is my minimal example code which I feel should compile:

using System;
                    
public class Program {
  void EraseGoodBlocks(bool OverridePreviousTests, ref bool[,] DeviceResults) {
    ForAllDevicesResults(eraser, ref DeviceResults);
    void eraser(byte BoardNo, byte DeviceNo, ref bool[,] device_results) {}
  }
    
  void ForAllDevicesResults(Action<byte, byte, bool[,]> action, ref bool[,] result){
    for (byte Board = 0; Board < 4; Board++){
      for (byte Device = 0; Device < 16; Device++){
        action(Board, Device, result);
      }
    }
  }
}

Where did I go wrong.