Generic Item Processing Error

Hello All-

I've got a source Exchange 2013 Exchange and using the MAGE agents, migrating to Office 365 as the target.

I'm seeing a large number of "Generic Item Processing Error" errors on many users.

I found this post in the support site:

And found this on the forums:

I've implemented the recommended solution but to no avail. 

Message size restrictions are not set at the user level but the web.config files is 64MB (67108864 bytes) and looking at the transport configuration, the max attachment size is 35MB. I set the "Set-MMExProjectOptions -SizeLimitInMbPerBatchUploadToO365 48" (48MB) and the error persists.

Anything I'm missing here?

Thanks in advance,