Hi Joshua,
I downloaded
our sample app with the
latest Unity plugin (3.8.0) and verified that there are no build errors after opening the generated xcworkspace file in XCode. I want to take note that the generated xcworkspace file on our end have the Enable Modules (C and Objective-C) set to No as well but we were able to run the generated project in our iOS test device (regardless if it is set to Yes or No).
I will check with the rest of the team regarding this and get back to you for any official feedback.
On the other hand, could you confirm if the issue is still reproducible on your end? If so, could you try generating the xcworkspace file from the sample app and see if the issue is reproducible on your end? Also, would you be able to provide to us privately (using Reply privately to author option) the Unity project (instead of the generated XCode project) you are having issues with so we can check on our end?