The value of the SIP address in the ProxyAddresses field in your local Active Directory is not in the correct format. Correct ...

The value of the SIP address in the ProxyAddresses field in your local Active Directory is not in the correct format. Correct the format in your local Active Directory to match sip:username@domain. After you correct it, the value will be updated in your %BRAND_ONLINE_SERVICES_DYNAMIC% directory during the next Active Directory synchronization.
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