I am getting a very similar error, but my project size seems to be much smaller:
And this is the errors from “Platform cook” in the message log:
We encountered an error preparing your project. Error: errors.com.epicgames.content-service.cook-failure, An error occurred while communicating with the game servers (Content (re)cook error errors.com.epicgames.cookplugin.cookfailure.
JOB_ID=12a153ce-e368-4e47-acb0-c512361f377d)., CookJobId:12a153ce-e368-4e47-acb0-c512361f377d
Too many warnings / errors, aborted processing of errors / warnings