Exchange 2010 Audit Failure with ActiveSync

A single user began to have issues with Active Sync on an iPhone 6. He removed his Exchange account and tried to add it back. When he attempted to add it back he receives an error, "Exchange Account Unable to verify account information." When I look at the logs in Even Viewer on the Exchange 2010 I see the Audit Failure under the Security event viewer. Below is an error example:
An account failed to log on.

Subject:
      Security ID:            SYSTEM
      Account Name:            ****-MX01$
      Account Domain:            <domain name>
      Logon ID:            0x3e7

Logon Type:                  8

Account For Which Logon Failed:
      Security ID:            NULL SID
      Account Name:            tllera
      Account Domain:            <domain name>

Failure Information:
      Failure Reason:            Unknown user name or bad password.
      Status:                  0xc000006d
      Sub Status:            0xc000006a

Process Information:
      Caller Process ID:      0x16c8
      Caller Process Name:      C:\Windows\System32\inetsrv\w3wp.exe

Network Information:
      Workstation Name:      ****-MX01
      Source Network Address:      166.176.121.***
      Source Port:            49793

Detailed Authentication Information:
      Logon Process:            Advapi  
      Authentication Package:      Negotiate
      Transited Services:      -
      Package Name (NTLM only):      -
      Key Length:            0

This event is generated when a logon request fails. It is generated on the computer where access was attempted.

The Subject fields indicate the account on the local system which requested the logon. This is most commonly a service such as the Server service, or a local process such as Winlogon.exe or Services.exe.

The Logon Type field indicates the kind of logon that was requested. The most common types are 2 (interactive) and 3 (network).

The Process Information fields indicate which account and process on the system requested the logon.

The Network Information fields indicate where a remote logon request originated. Workstation name is not always available and may be left blank in some cases.

The authentication information fields provide detailed information about this specific logon request.
      - Transited services indicate which intermediate services have participated in this logon request.
      - Package name indicates which sub-protocol was used among the NTLM protocols.
      - Key length indicates the length of the generated session key. This will be 0 if no session key was requested.
----End-----
I attempted to add my account to my iphone and i receive the same error. I'm now seeing this error with anther user, but i haven't confirmed if he's not receiving email on his phone (Android).

Any suggestions would really help.

Thank You
daviddgAsked:
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David Johnson, CD, MVPOwnerCommented:
Is he using the correct password  try logging on as domain\username
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