Event ID: 41110
The Exchange mailbox provisioning task failed during provisioning group processing. The task has stopped.
Task: Exchange Provisioning Task for testing
Domain: testing
Provisioning group:
Group member:
Error: Unable to get AD path for [testing\] - error code [87]
Trace: at EVManagedLibrary.DirectoryHelperWrapper.GetFQDNFromFlatDomainName(String nameStr, String dcStr) at KVS.EnterpriseVault.ExchangePolicySync.ExchangePolicySynchronization.CalculateDomainFQDN()
at KVS.EnterpriseVault.ExchangePolicySync.ExchangePolicySynchronization.Initialize()
at KVS.EnterpriseVault.ExchangePolicySync.ExchangePolicySynchronization.RunSynchronization(ExchangePolicySyncTaskEntry taskEntry, CheckControlEventsDelegate checkControlEvents, Boolean reportMode)
V-437-41110
In a Dtrace of the EVExchangePolicySyncTask, it shows the IP for a GC and not a name.
61 18:51:18.487 [4332] (EvExchangePolicySyncTask) <6828> EV-M {EXCHANGEPOLICYSYNCHRONIZATION.EN_US} Binding to object [GC://10.10.11.14] (serverBind = True)
62 18:51:18.503 [4332] (EvExchangePolicySyncTask) <6828> EV-H {EXCHANGEPOLICYSYNCHRONIZATION.EN_US} Processing domain [testing] using DC [GC://10.10.11.14]
63 18:51:18.503 [4332] (EvExchangePolicySyncTask) <6828> EV-M {EXCHANGEPOLICYSYNCHRONIZATION.EN_US} Calculating FQDN for domain [testing]
64 18:51:18.503 [4332] (EvExchangePolicySyncTask) <6828> EV:M CDirectoryHelper::NameToFQDN() - Calling CrackDsName() with NT4 to FQDN
65 18:51:18.503 [4332] (EvExchangePolicySyncTask) <6828> EV:M DirectoryHelper::CrackDsName() - DC = [10.10.11.14], NameToCrack = [testing\]
66 18:51:18.503 [4332] (EvExchangePolicySyncTask) <6828> EV:M DirectoryHelper::CrackDsName() - Calling DsBind()
67 18:51:18.534 [4332] (EvExchangePolicySyncTask) <6828> EV:M DirectoryHelper::CrackDsName() - Method failed with error [87]
68 18:51:18.534 [4332] (EvExchangePolicySyncTask) <6828> EV-H {EXCHANGEPOLICYSYNCHRONIZATION.EN_US} Fatal exception raised while processing provisioning group [
When a Global Catalog server is set manually, it should be specified by its Fully Qualified Domain Name, rather than its IP address.
This name can be set manually on the Properties of the domain in the Vault Admin Console:

Look in both places to make sure that if it is set manually, it is set using the FQDN and not the IP address.