This is an example of the type of error in the sync log (from an exchange sync)
"Write permission denied for value "ArchiveWarningQuota"
There are some hard coded dependencies in the customiser modules. In this example between "IsArchiveEnabled" and other exchange mailbox attributes.
But, these dependencies should be bypassed if the fullsync variable is set.
In this case the fullsync variable had been set off.
Check the sync project:
Sync Editor --> Workflows --> Edit workflow steps --> There is a tick box "Data Import".
If this is ticked the fullsync variable is set to false.