I recently ran into an issue after configuring Azure Active Directory Connect with hybrid Exchange that certain attributes couldn't be written back to the on-prem directory. This manifests as errors in the sync tool, specifically a "Connected data source error code 8344" and "Insufficient access rights to perform the operation" on the export task. There's plenty of documentation that shows which permissions are required to support writeback of exactly 8 attributes. For some reason it seems that the AAD Connect setup tool does not correctly add these permissions when selecting Hybrid Exchange mode. There's a number of scripts out there, but two that I'll point out are this one from the Technet Gallery which appears to support a number of different configuration scenarios, as well as this one from c7solutions which is quite simple but effective. The c7 post also has a great explanation of why these types of scripts are necessary. The script is so useful that I've also generated an archive of the page here, in case it is ever moved/removed.
After running the script for a couple of minutes most export errors were resolved. The specific issue can also be caused by an AD object with blocked inheritance. This script from the technet gallery can be used to discover which users have inheritance blocked. Once found they can either be fixed, or could be manually targeted for permissions with the aforementioned scripts.
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