Blackberry 10 active sync error

I have a user with a Blackberry passport device which has an BES10 OS. The activation goes through for the device but when updating the Windows/ network password field on the device it comes up with the following error:

"Your account ActiveSync: – cannot be authenticated with your Service provider. Please make sure your account details are correct”

I have checked the following is enabled:

AD inhertiance - Enabled
Active Sync and Webmail - Enabled
Tried a different exchange profile for the workspace and re-activated.
I have deleted the account and re-added then activated it again.

In our instances our BES 10 and BES 5 virtual machine environments are stand alone. I noticed today the user in question had not been removed from our BES 5 environment. That account from BES5 was deleted but didn't help with the issue.

The user has recently moved to Exchange 2013 but other users on the server have also moved with no errors. Is there something i am missing????
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MBealeISGAuthor Commented:
Just to add to the issue it would also been that to activate it on a new handset i have with me and not the user in question also fails to work.

Also in terms of our environment we have recently migrated exchange 2013 from 2010. so it could be that there is a compatitilby issue.

Going to raise a ticket with Blackberry and see what Blackberry have to say.

I will let you know how it goes. Any other advice for me to try let me know.
MBealeISGAuthor Commented:
Ok so, looks like i have answered my own question. As silly as it would appear. I forgot to add the Exchange 2013 environment to the mail profile list on BES 10.

To add a new mail server under Blackberry Solution Management > Profiles > Create an email profile

Add the Name and description of the new exchange 2013 mail server then click continue.

Under profile settings select Microsfot activesync. Add the Server name or IP address of the new exchange server. Leave server port blank.

Next, add any other settings such as SSl, Days to sync and what to else to sync such as the calendar. Then (if applicable set an encryption level) click save.

Then go to the user who couldn't activate before and change the mail server profile to be the newly created exchange server. then set up an activation password.

This should give you no more errors.

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