Office 365 to Exchange 2010 Hybrid Mail Box Migration

I'm working on setting up a pilot for Office 365. We have Exchange 2010 SP3, in a DAG configuration (two front end, and 2 mail box servers). I have setup the hybrid configuration. All firewall ports are open.
Problem 1: We can move mail boxes up to office 365 with out a problem. When we try to move them back we get
"[email protected]
Status: Failed
[email protected] Skipped item details
Data migrated:  Migration rate:  Error: MigrationTransientException: The call to ‎'https://webmail.contoso.com/EWS/mrsproxy.svc City-ExchCAS1.contoso.local ‎(14.3.178.0 caps:05FFFF)‎‎' failed. Error
details: The server was unable to process the request due to an internal error. For more information about the error, either turn on IncludeExceptionDetailInFaults ‎(either from ServiceBehaviorAttribute or from the <serviceDebug> configuration behavior)‎
on the server in order to send the exception information back to the client, or turn on tracing as per the Microsoft .NET Framework 3.0 SDK documentation and inspect the server trace logs.. --> The call to ‎'https://webmail.contoso.com/EWS/mrsproxy.svc
City-ExchCAS1.contoso.local ‎(14.3.178.0 caps:05FFFF)‎‎' failed. Error details: The server was unable to process the request due to an internal error. For more information about the error, either turn on IncludeExceptionDetailInFaults ‎(either from ServiceBehaviorAttribute
or from the <serviceDebug> configuration behavior)‎ on the server in order to send the exception information back to the client, or turn on tracing as per the Microsoft .NET Framework 3.0 SDK documentation and inspect the server trace logs.. --> The
server was unable to process the request due to an internal error. For more information about the error, either turn on IncludeExceptionDetailInFaults ‎(either from ServiceBehaviorAttribute or from the <serviceDebug> configuration behavior)‎ on the server
in order to send the exception information back to the client, or turn on tracing as per the Microsoft .NET Framework 3.0 SDK documentation and inspect the server trace logs."
I know someone is going to say "Trun on IncludeExceptionDetailInFaults", please tell me how to do that. I'm not an exchange expert, or an IIS expert.
Problem 2: We can email to account in Office 365. Office 365 can't email to on-site exchange. We do have Mimecast as a spam filter, and I've been digging in that to see if that is a problem.
Just looking to see if anyone has an idea of thing to check for this.

Fixed
1. Connect to the Office 365 Portal http://portal.microsoftonline.com 
2. Click “Admin” in the upper left hand corner and go to “Exchange”
3. Click “migration”
4. Click “+” and then “Migrate from Exchange Online”
5. Click “+” 
6. Add the users that you need to move back to Exchange on site at Dedicated Computing
7. Click “next”
8. Click “next”
9. Put any name for “*New migration batch name:”
10. Put <your email domain> for “*Target delivery domain:”
11. Put GUID of target database in for “*Target database:”
Commands for Exchange Management PowerShell to find GUID
i. Get-MailboxDatabase
ii. Get-MailboxDatabase <insert database name from last command> |fl
12. Click “next”
13. Make sure both radio buttons for Automatically are check, and click “new”

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