Exchange 2013 SP1 and Windows 2012 R2 DAG Database Redudancy and Check Failure

I have problem with DAG in Exchange 2013;

My environment are :

2 node Exchange Server 2013 SP1 running mailbox role in Hyper-V Windows 2012 at different physical server on same subnet. The storage are in different size

Create DAG (mboxs) and add membership (mbox1,mbox2) from EAC is working fine.

But, failover never happen when mbox1 is down.

Check with Test-Replication Health there are FAILED in DatabaseRedudancy and DatabaseAvailabiliy

There were database redundancy check failure for database "MBOX.."

There were database availability check failure for database "MBOX.."

Check with Get-MailboxDatabaseCopyStatus the databases are in mounted status and healthy ContentIndexState.

Check with validate cluster configuration there were no significant error only some warning.

Already disabled IPv6 and Windows Firewall too.

What might be the cause ? is there any workaround to solve this.

Please kindly help.

regards

Reza