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Can you give details on the AD for both a.com and b.com users?
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Can you give details on the AD for both a.com and b.com users?

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Contacted Microsoft and they suggested clearing the old devices.
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Contacted Microsoft and they suggested clearing the old devices.

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Our Lync 2013 Server hosts to sip domains. &nbsp;a.com and b.com<br />
<br />
I have an employee who can log in to b.com fine on his computer but not on his mobile device.<br />
Users in both a.com and b.com can log in on both computers and mobile devices, myself included.<br />
I attempted to log in as the problem user on my iPhone and was unable. &nbsp;<br />
<br />
The troublesome user account's sip domain is username@b.com. &nbsp;<br />
Not sure what is going on. &nbsp;I tried removing then adding the AD account from the Lync solution via the control panel.<br />
I've compared AD and Lync 2013 account information with a b.com user that CAN log in on a mobile device and they are configured the same way. &nbsp;<br />
<br />
I'm at a loss.
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Our Lync 2013 Server hosts to sip domains.  a.com and b.com

I have an employee who can log in to b.com fine on his computer but not on his mobile device.
Users in both a.com and b.com can log in on both computers and mobile devices, myself included.
I attempted to log in as the problem user on my iPhone and was unable.  

The troublesome user account's sip domain is username@b.com.  
Not sure what is going on.  I tried removing then adding the AD account from the Lync solution via the control panel.
I've compared AD and Lync 2013 account information with a b.com user that CAN log in on a mobile device and they are configured the same way.  

I'm at a loss.

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