Error in Ex0_2010_EX0Mailbox_Insert

Hello Guys,

I'd like to seek your insight on this issue, I have encountered PROZEN job in the queue related to Ex0Mailbox provisions. Please see error logs below.

ErrorMessages (2020-04-27 05:37:30.770) [1777018] Error executing synchronization project (Microsoft Exchange 2010 'IOM' (only recipients from as.iom.net))'s workflow (Provisioning).
[1777124] Error executing projection step (Mailbox) of projection configuration (Provisioning (Provisioning)).
[1777219] Error executing synchronization step (Mailbox)!
[1777004] Method (Insert (Insert)) could not be executed successfully.
[System.Management.Automation.ActionPreferenceStopException] The running command stopped because the preference variable "ErrorActionPreference" or common parameter is set to Stop: Load balancing failed to find a valid mailbox database.
at VI.Projector.JobComponent.ProjectorComponent._AdHocProjection()
at VI.Projector.Database.ProjectorExecutor.Project(ISession session, IProjectionConfiguration configuration, ProjectionOption options, ISystemObject adHocObject, CancellationToken cancellationToken)
at VI.Projector.Projection.Extensions.Execute(IProjectorEngine engine, IProjectionConfiguration configuration, ProjectionOption options, ISystemObject adHocObject, CancellationToken cancellationToken)
at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions).

appreciate if anyone can point me to right direction.

Thanks in Advance.

John

regards,

John