Some AD Objects are not syncing from source domain to target. (4320971)

Some AD Objects are not syncing from source domain to target.

We need to understand why some objects are not syncing.  We have several users, shared mailboxes and distribution lists (groups) that are not syncing even though they meet the criteria.

No errors in sync logs for the above

objects still not sync'ing after adding description, saving to increase the USN and running user sync (full).  uploading all logs.  Also, collected logs with high setting from a group sync.  

The object had the AvailableForDirSync attribute set to 0 (False) in SQL

Set AvailableForDirSync to true using the following SQL query:

UPDATE [BTCodex].[dbo].[BT_Person]

SET AvailableForDirSync = 1

WHERE BT_Person_PK = <ObjectPKValue>

Also confirm 'Synchronize Accompanying Groups' is unchecked for ALL Directory Sync profiles (this includes all disabled and unused profiles)
Delete any unused profiles. You can export these as a backup if you will require the profile at a later date.

In SQL, Person table, Confirm this object has the following values in these columns

1 = True
0 = False

NeedsAttention:    1
AvailableForDirSync :1    
SyncAccompanyingGroups: 0
TypeOfTransaction: Insert