Hi,
Oh - the Troubleshooting section reported a different issue - "UGC Not Visible in MongoDB" :
If you have comments or other user generated content (UGC) that existed prior to changing the repository, you need to convert the pre-existing UGC to conform to the structure required for the SRP API.
The AEM Communities UGC Migration Tool is an open source migration tool, available on GitHub, that can be customized to export UGC from earlier versions of AEM social communities and import the UGC into AEM Communities 6.
I'll add this to the troubleshooting section as "Pre-existing UGC Not Visible in MongoDB"
- JK