After I deleted a DB on Exchange 2013 SP3 CU10 I am seeing these errors. This was a single DB part of no DAG copies
Outlook Web App failed to create ExchangePrincipal for S-1-5-21-1060284298-1214440339-682003330-68046. IsMonitoringRequest: True. Error: Microsoft.Exchange.Data.Storage.ObjectNotFoundException: The Active Directory user wasn't found.
at Microsoft.Exchange.Data.Storage.ExchangePrincipalFactory.FromUserSid(IRecipientSession recipientSession, SecurityIdentifier userSid, RemotingOptions remotingOptions) at Microsoft.Exchange.Clients.Owa2.Server.Core.OwaClientSecurityContextIdentity.InternalCreateExchangePrincipal()
Can't find much on the net.
Also seeing Event ID:2160 MSExchange ADAccess after deleting the above DB.
I restarted the Mailbox replication service, IISReset and also restarted the MS Exchange Health Manager Service no luck
Thank you