WORKAROUND
Ensure that the values for both "Max Worker Thread | Sync Pass Change" and "Maximum Threads | Max Sync Pass Change Threads" is set to a value other than zero.
The Agent can not start if it is set to zero percent and zero threads and the warning "The SyncPassChange failed to enable due to lack of resource allocation. Please allocate full load percentage and max threads for SyncPassChange" will be displayed.