I wanted to add users without notifying them because the site isn’t launched yet.
In the end, I ended up using this plugin: https://ww.wp.xz.cn/plugins/members-import/
Just download the plugin and create the appropriate CSV file and import those users. You have the option to toggle an email sent to them when uploading the CSV file.
Is there really no solution to disable emails from sending out? I really miss that checkbox…