If you set a group as default reviewer, not everyone in the group seems to be getting the email notification. Individual users seems to work.
Unfortunately our evaluation version of Workzone plugin has already expired so I cannot verify this. I'll ask from the developer who reported this if he remembers how it was.
EDIT: Now that I went throught the existing Issues of the Workzone plugin I noticed this one, which might be related: https://bitbucket.org/izymesdev/workzone/issue/45/large-group-only-adds-first-19-users
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