Unable to Start Recording on Replay Kit (iOS 12)

I'm trying to start a screen recording with a UI button On click, in an AR app using Replay Kit. Both my iOS devices use (iOS 12.4.1). I'm using the following code but

the recording doesn't start and always results in No recording available.

     bool canRecord;
     bool recording;
     string error = ""; 
     
         private void Start()
         {
             if(!ReplayKit.APIAvailable)
             {
                 Debug.Log("Replay Kit Not found or Enabled");
                 canRecord = false;
             }
             else
             {
                 Debug.Log("Replay Kit is available");
                 canRecord = true;
             }
             recording = ReplayKit.isRecording;
         }
     
         public void StartRecording()
         {
             print("start recording clicked");
             if(canRecord == true && recording != true)
             {
                 try{
                     recording = !recording;
                     if(recording)
                     {
                         ReplayKit.StartRecording();
                     } 
                 }
                 catch (Exception e)
                 {
                     error = e.ToString();
                     Debug.Log(error);
                 }
             }     
         }
     
         public void StopRecording()
         {
             print("stop recording clicked");
             try
             {
                 recording = !recording;
                 if(!recording)
                 {
                     if(ReplayKit.isRecording)
                     {
                         ReplayKit.StopRecording();
                     }
                     else
                     {
                         Debug.Log("Recording Didn't happen");
                     }
                 }  
             }
             catch (Exception e)
             {
                 error = e.ToString();
                 Debug.Log(error);
             }
         }
     
         public void DiscardRecording()
         {
             try
             {
                 print("discard clicked");
                 if (ReplayKit.recordingAvailable)
                 {
                     ReplayKit.Discard();
                 }
                 else
                 {
                     print("no recording available");
                 }
             }
             catch(Exception e)
             {
                 error = e.ToString();
                 Debug.Log(error);
             }
         }
     
         public void PreviewRecording()
         {
             try
             {
                 print("preview clicked");
                 if (ReplayKit.recordingAvailable)
                 {
                     ReplayKit.Preview();
                 }
                 else
                 {
                     Debug.Log("no recording available");
                 }
             }
             catch(Exception e)
             {
                 error = e.ToString();
                 Debug.Log(error);
             }
         }