Region monitoring does not work in iOS if there are no major regions in the region

In my iOs application, I am trying to track a certain area of ​​beacons by different parameters as follows:

Method 1 - Scope with only UUID and ID:

In the above scenario, I start tracking a beacon zone followed by a code where only the uuid and id are listed.

CLBeaconRegion *region = [[CLBeaconRegion alloc] initWithProximityUUID:convertedUuid identifier:strIdentifier]; 

      

        
        
        
      

    

Method 2 - Scope with UUID, Primary and ID:

In the above scenario, I start to track the beacon zone followed by a method that has uuid, major and identifier set

CLBeaconRegion  *region = [[CLBeaconRegion alloc] initWithProximityUUID:convertedUuid  major:[self.major intValue] identifier:strIdentifier];

      

        
        
        
      

    

Method 3 - Region with great confusion and identifier:

In the above scenario, I start tracking the beacon zone followed by a method that has all the uuid, major, minor and identifier values ​​set

CLBeaconRegion  *region = [[CLBeaconRegion alloc] initWithProximityUUID:convertedUuid  major:[self.major intValue] minor:[self.minor intValue] identifier:strIdentifier];

      

        
        
        
      

    

Now, having considered the above 3 methods, I start monitoring the area like this:

[self.locationManager startMonitoringForRegion:region];

      

        
        
        
      

    

Unfortunately only with the 3rd method the delegate input and output beacons appear. but when i use the 1st or 2nd method i couldnt get the delegate in and out of the scope.

Note. Don't run the entire method at the same time. I only use one method at a time.

can anyone give any feedback or provide any help as to why the other region method doesn't work but only the third method works?