NetworkMigrationManager with external LostConnectionCall

Hello!

I am trying to establish a new Connection when the Host drops away. I get from my Platform the information to which new Host I should Connect. We are using pure Peer to peer connections. I am now inheriting from NetworkMigrationManager.

All I do is Add is this method which I call as soon I get the new Information from the platform:

Code (CSharp):

1.  
2.         public void HostChanged(bool isNewHost, System.Net.EndPoint newEndpoint)
3.         {
4.             Debug.Log("I have to change to a new Host!!");
5.             if (isNewHost)
6.             {
7.                 Debug.Log("I am becomming the new Host!!");
8.                 waitingToBecomeNewHost = true;
9.                 LostHostOnClient(NetworkManager.singleton.client.connection);
10.                 BecomeNewHost(5555);
11.             }
12.             else
13.             {
14.                 Debug.Log("I am switching to a new host!!");
15.                 Reset(oldServerConnectionId);
16.                 NetworkManager.singleton.secureTunnelEndpoint = newEndpoint;
17.                 NetworkManager.singleton.client.ReconnectToNewHost(newEndpoint);
18.             }
19.         }

But when this code is called on the new Server I get this error:

How should this pice of code look correctly? Any hints from someone?

Thanks!
Matthias