Failed to collect information from domain dc=company,dc=com.displayName attribute not found (4254842)

There is a frequent event with a "displatName attribute not found" message similar to the following:

<Company Calendars>: Failed to collect information from domain dc=company,dc=corp.displayName attribute not found.displayName attribute not found.[EIP: 0x0144E83F,0x0144CBF7][EIP: 0x03636F8A,0x03687C22] 0x80040C06

After enabling debug logging, ADsync.log contains errors similar to the following

18/12 16:17:34:121 | BaseCollector.cpp(1516)        | 3096 | AddCollectionMember user:{045D54D6-DBE4-48D6-A1ED-36F01578EC7B}
18/12 16:17:34:121 | MembershipCollector.cpp(95)    | 3096 | *** EXCEPTION Exiting CMembershipCollector::OnObjectFound
18/12 16:17:34:121 | SearchCollector.cpp(165)       | 3096 | *** EXCEPTION Exiting CSearchCollector::SearchItem
18/12 16:17:34:121 | SearchCollector.cpp(108)       | 3096 | *** EXCEPTION Exiting CSearchCollector::SearchDomain
18/12 16:17:34:121 | ErrorStateHolder.h(63)         | 3096 | SetErrorState=-2147218426
18/12 16:17:34:121 | CollectionAlerter.h(102)       | 3096 | Collection <Company Calendars>: Failed to collect information from domain dc=company,dc=corp.displayName attribute not found.displayName attribute not found.[EIP: 0x0144E83F,0x0144CBF7][EIP: 0x03636F8A,0x03687C22] 0x80040C06
18/12 16:17:34:246 | SearchCollector.cpp(70)        | 3096 | *** EXCEPTION Exiting CSearchCollector::SearchClass
18/12 16:17:34:246 | SearchCollector.cpp(35)        | 3096 | *** EXCEPTION Exiting CSearchCollector::CollectItems
18/12 16:17:34:246 | MembershipCollector.cpp(61)    | 3096 | *** EXCEPTION Exiting CMembershipCollector::CollectItems

Note down the guid next to AddCollectionMember and search for it in CalendarSender.log

After Process object:{guid} entry there will be a list of attribute including the users primary email

18/12 16:17:28:763 | CalendarProcessorImpl.cpp(92)  | 772  | Process object : {045D54D6-DBE4-48D6-A1ED-36F01578EC7B}
...
18/12 16:17:28:903 | UsersCache.cpp(183)            | 772  | SMTP: JSmith@company.com

Problem users can be located by searching AD for any mail- or mailbox-enabled objects without a display name or analyzing the log files.

This LDAP query should find any Mail/Mailbox object missing a display name.

(&(legacyExchangeDN=*)(!displayName=*))

To resolve the issue make sure every published object has the display name attribute filled out.